{
  "format": "construct-scene",
  "version": 2,
  "id": "o1-leica-m3",
  "title": "Leica M3 · 1954 / Summicron 5 cm 1:2",
  "subject": {
    "category": "object",
    "summary": "Approximate measured reconstruction of an early double-stroke Leica M3 with the original collapsible 50 mm Summicron. Opening presents manual lens extension and an illustrative locking twist, not an automatic camera mechanism.",
    "accuracy": "approximate",
    "synthetic": false
  },
  "units": "m",
  "seed": 1954,
  "sources": [
    {
      "id": "request",
      "title": "Public showcase commission",
      "ref": "Leica M3 (1954), collapsible 50 mm Summicron extends on presentation opening; no reference images or assigned palette.",
      "kind": "user_request",
      "rights": "user_private"
    },
    {
      "id": "leica-history",
      "title": "Leica official 1954 chronology",
      "ref": "https://timeline.leica-camera.com/en/years/1954",
      "kind": "document",
      "rights": "reference_only"
    },
    {
      "id": "auction",
      "title": "Leitz Auction A02280, M3 700074 with Summicron 1115548",
      "ref": "https://www.leitz-auction.com/en/Leica-M3-First-Batch-Double-Corner/A02280",
      "kind": "document",
      "rights": "reference_only"
    },
    {
      "id": "dimensions",
      "title": "Published M3 specification",
      "ref": "https://en.wikipedia.org/wiki/Leica_M3 ; https://www.lomography.com/magazine/257219-lomopedia-leica-m3 ; https://leica-m.de/leica-m3/",
      "kind": "document",
      "rights": "reference_only"
    },
    {
      "id": "lens-spec",
      "title": "KJ Vogelius: collapsible Summicron specifications and operation",
      "ref": "https://gear.vogelius.se/-reviews/leica-summicron-50-collapsible/index.html",
      "kind": "document",
      "rights": "reference_only"
    },
    {
      "id": "leica-lens",
      "title": "Leica Classic: 1954 M-mount Summicron 2/5cm SOOIC-M",
      "ref": "https://classic.leica-camera.com/en/Leica-Summicron-2-5cm-collapsible-SOOIC-M/35868-6",
      "kind": "document",
      "rights": "reference_only"
    },
    {
      "id": "a1",
      "title": "Auction photograph A1",
      "ref": "https://www.leitz-auction.com/media/dc/20/0c/1756994722/A02280_1.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "a2",
      "title": "Auction photograph A2",
      "ref": "https://www.leitz-auction.com/media/73/ff/2a/1756994725/A02280_2.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "a3",
      "title": "Auction photograph A3",
      "ref": "https://www.leitz-auction.com/media/bb/60/1c/1756994729/A02280_3.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "a4",
      "title": "Auction photograph A4",
      "ref": "https://www.leitz-auction.com/media/f8/02/4b/1756994733/A02280_4.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "a5",
      "title": "Auction photograph A5",
      "ref": "https://www.leitz-auction.com/media/57/c1/d3/1756994737/A02280_5.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "a6",
      "title": "Auction photograph A6",
      "ref": "https://www.leitz-auction.com/media/1c/e3/cc/1756994740/A02280_6.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "a7",
      "title": "Auction photograph A7",
      "ref": "https://www.leitz-auction.com/media/92/30/68/1756994744/A02280_7.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "a8",
      "title": "Auction photograph A8",
      "ref": "https://www.leitz-auction.com/media/82/92/e6/1756994748/A02280_8.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "a9",
      "title": "Auction photograph A9",
      "ref": "https://www.leitz-auction.com/media/c3/19/63/1756994752/A02280_9.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "lens-photo",
      "title": "Leica Classic three-quarter lens photograph",
      "ref": "https://classic.leica-camera.com/media/88/2a/85/1782211229/35868_6_a.jpg",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "section",
      "title": "Summicron optical schematic, not a prescription",
      "ref": "https://gear.vogelius.se/-reviews/leica-summicron-50-collapsible/summicron-50-collapsible-diagram.png",
      "kind": "observation",
      "rights": "reference_only"
    },
    {
      "id": "studio",
      "title": "Reconstruction studio presentation design",
      "ref": "Assembly, quiet scan, camera tour, lock-turn angle and animation timing are decorative choices.",
      "kind": "generated",
      "rights": "synthetic"
    }
  ],
  "facts": [
    {
      "key": "model",
      "value": "Leica M3",
      "certainty": "verified",
      "source": "leica-history"
    },
    {
      "key": "year",
      "value": 1954,
      "certainty": "verified",
      "source": "leica-history"
    },
    {
      "key": "width",
      "value": 0.138,
      "certainty": "verified",
      "source": "dimensions",
      "note": "Published nominal body specification; excludes lens. Not outline coordinates. Depth convention differs from Camera-wiki (38 mm).",
      "unit": "m"
    },
    {
      "key": "height",
      "value": 0.077,
      "certainty": "verified",
      "source": "dimensions",
      "note": "Published nominal body specification; excludes lens. Not outline coordinates. Depth convention differs from Camera-wiki (38 mm).",
      "unit": "m"
    },
    {
      "key": "depth",
      "value": 0.0335,
      "certainty": "verified",
      "source": "dimensions",
      "note": "Published nominal body specification; excludes lens. Not outline coordinates. Depth convention differs from Camera-wiki (38 mm).",
      "unit": "m"
    },
    {
      "key": "early-advance",
      "value": "Double-stroke film advance",
      "certainty": "verified",
      "source": "auction"
    },
    {
      "key": "early-top",
      "value": "First-batch two-corner top plate",
      "certainty": "verified",
      "source": "auction"
    },
    {
      "key": "lens",
      "value": "Summicron 5 cm 1:2",
      "certainty": "verified",
      "source": "auction"
    },
    {
      "key": "lens-focal-length",
      "value": 50,
      "certainty": "verified",
      "source": "leica-lens",
      "unit": "mm"
    },
    {
      "key": "lens-aperture",
      "value": 2,
      "certainty": "verified",
      "source": "leica-lens"
    },
    {
      "key": "lens-extended-length",
      "value": 0.04,
      "certainty": "verified",
      "source": "lens-spec",
      "unit": "m"
    },
    {
      "key": "lens-collapsed-length",
      "value": 0.026,
      "certainty": "verified",
      "source": "lens-spec",
      "unit": "m"
    },
    {
      "key": "lens-extension",
      "value": 0.014,
      "certainty": "inferred",
      "source": "lens-spec",
      "note": "Calculated 40 minus 26 mm; source does not separately specify travel.",
      "unit": "m"
    },
    {
      "key": "filter-thread",
      "value": 0.039,
      "certainty": "verified",
      "source": "lens-spec",
      "unit": "m"
    },
    {
      "key": "optical-elements",
      "value": 7,
      "certainty": "verified",
      "source": "lens-spec"
    },
    {
      "key": "optical-groups",
      "value": 6,
      "certainty": "verified",
      "source": "lens-spec"
    },
    {
      "key": "diaphragm-blades",
      "value": 10,
      "certainty": "verified",
      "source": "lens-spec"
    },
    {
      "key": "extension-operation",
      "value": "Pull forward to stop, then twist to lock",
      "certainty": "verified",
      "source": "lens-spec"
    },
    {
      "key": "body-outline",
      "value": "138 mm rounded capsule, 33.5 mm deep; covering 4..52 mm; lower deck 69 mm; raised top 77 mm",
      "certainty": "inferred",
      "source": "a6",
      "note": "A6 body side ~331x798 pixels; 77/798 mm per pixel. Round-end radius 16.75 mm is a fitted primitive, not a factory coordinate."
    },
    {
      "key": "front-layout",
      "value": "Window x=-32.1,+10.6,+36.8 mm; lens x=+5.3,y=31 mm; timer x=-44.9 mm",
      "certainty": "inferred",
      "source": "a5",
      "note": "A5 width x163..1320 at 1500x1000 preview, scaled to 138 mm; perspective correction and heights approximate."
    },
    {
      "key": "finder-outlines",
      "value": "Bevelled rectangular finder and illuminator rims; small isolated rangefinder window",
      "certainty": "inferred",
      "source": "a3",
      "note": "A3 outline measurements, cross-checked A5: main rim 24x19, central rim 20x17, small rim 11x8 mm."
    },
    {
      "key": "top-layout",
      "value": "Rewind x=+62.8, shoe +1.9, speed -18.2, release -44.5, counter -59.2 mm",
      "certainty": "inferred",
      "source": "a9",
      "note": "A9 image width~1140 pixels, scaled to 138 mm and mirrored relative to front view."
    },
    {
      "key": "rear-layout",
      "value": "Inset 92x43 mm loading panel, 25 mm reminder disc, eyepiece and paired flash sockets",
      "certainty": "inferred",
      "source": "a7",
      "note": "Rear oblique image proportions; no factory rear panel coordinates located."
    },
    {
      "key": "lens-profile",
      "value": "Mount diameter 53 mm, focus 50, telescope 32, head 44, front clear glass 33 mm",
      "certainty": "inferred",
      "source": "lens-photo",
      "note": "Fitted diameter ratios head/base~0.88, tube/base~0.64; E39 is the documented thread, not outer diameter."
    },
    {
      "key": "optical-profile",
      "value": "Seven schematic optical forms in six groups",
      "certainty": "inferred",
      "source": "section",
      "note": "Diagram x170..686, axis y437; relative element centres estimated 0.09,0.23,0.30,0.35,0.44,0.77,0.96. Not an optical prescription."
    },
    {
      "key": "top-maker",
      "value": "Leica",
      "certainty": "inferred",
      "source": "a9",
      "note": "Observed engraved word; normal typeface label, not a copied script logo."
    },
    {
      "key": "top-origin",
      "value": "ERNST LEITZ GMBH / WETZLAR GERMANY",
      "certainty": "inferred",
      "source": "a9",
      "note": "Text read from A9; placement and font simplified."
    },
    {
      "key": "aperture-scale",
      "value": "2   2.8   4   5.6   8   11   16",
      "certainty": "inferred",
      "source": "a9",
      "note": "Observed aperture scale; flattened typesetting is a reconstruction abstraction."
    },
    {
      "key": "speed-scale",
      "value": "1  2  5  10  25  50  100  200  500  1000",
      "certainty": "inferred",
      "source": "a9",
      "note": "Early speed progression visible in A9, not later normalized scale."
    },
    {
      "key": "film-reminder",
      "value": "ASA / DIN",
      "certainty": "inferred",
      "source": "a7",
      "note": "Observed rear reminder inscription; scale ticks simplified."
    },
    {
      "key": "opening-design",
      "value": "14 mm lens deployment, then illustrative 12 degree locking twist; body remains closed",
      "certainty": "decorative",
      "source": "studio",
      "note": "Presentation opening is not mechanically coupled to a rear door or powered extension. Twist angle is not measured."
    }
  ],
  "parts": [
    {
      "id": "removable-baseplate",
      "label": "Removable Baseplate",
      "role": "mass",
      "stage": 0,
      "certainty": "inferred",
      "shape": {
        "type": "extrude",
        "profile": [
          [
            0.05225,
            -0.01675
          ],
          [
            0.0565852,
            -0.0161793
          ],
          [
            0.060625,
            -0.0145059
          ],
          [
            0.064094,
            -0.011844
          ],
          [
            0.0667559,
            -0.008375
          ],
          [
            0.0684293,
            -0.0043352
          ],
          [
            0.069,
            0.0
          ],
          [
            0.0684293,
            0.0043352
          ],
          [
            0.0667559,
            0.008375
          ],
          [
            0.064094,
            0.011844
          ],
          [
            0.060625,
            0.0145059
          ],
          [
            0.0565852,
            0.0161793
          ],
          [
            0.05225,
            0.01675
          ],
          [
            -0.05225,
            0.01675
          ],
          [
            -0.0565852,
            0.0161793
          ],
          [
            -0.060625,
            0.0145059
          ],
          [
            -0.064094,
            0.011844
          ],
          [
            -0.0667559,
            0.008375
          ],
          [
            -0.0684293,
            0.0043352
          ],
          [
            -0.069,
            0.0
          ],
          [
            -0.0684293,
            -0.0043352
          ],
          [
            -0.0667559,
            -0.008375
          ],
          [
            -0.064094,
            -0.011844
          ],
          [
            -0.060625,
            -0.0145059
          ],
          [
            -0.0565852,
            -0.0161793
          ],
          [
            -0.05225,
            -0.01675
          ]
        ],
        "height": 0.004,
        "axis": "y"
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a6",
      "basis": [
        "body-outline"
      ],
      "note": "A6 side and A9 plan: fitted capsule footprint, 138x33.5 mm; 4 mm base lip inferred."
    },
    {
      "id": "rounded-main-shell",
      "label": "Rounded Main Shell",
      "role": "mass",
      "stage": 1,
      "certainty": "inferred",
      "shape": {
        "type": "extrude",
        "profile": [
          [
            0.05225,
            -0.01675
          ],
          [
            0.0565852,
            -0.0161793
          ],
          [
            0.060625,
            -0.0145059
          ],
          [
            0.064094,
            -0.011844
          ],
          [
            0.0667559,
            -0.008375
          ],
          [
            0.0684293,
            -0.0043352
          ],
          [
            0.069,
            0.0
          ],
          [
            0.0684293,
            0.0043352
          ],
          [
            0.0667559,
            0.008375
          ],
          [
            0.064094,
            0.011844
          ],
          [
            0.060625,
            0.0145059
          ],
          [
            0.0565852,
            0.0161793
          ],
          [
            0.05225,
            0.01675
          ],
          [
            -0.05225,
            0.01675
          ],
          [
            -0.0565852,
            0.0161793
          ],
          [
            -0.060625,
            0.0145059
          ],
          [
            -0.064094,
            0.011844
          ],
          [
            -0.0667559,
            0.008375
          ],
          [
            -0.0684293,
            0.0043352
          ],
          [
            -0.069,
            0.0
          ],
          [
            -0.0684293,
            -0.0043352
          ],
          [
            -0.0667559,
            -0.008375
          ],
          [
            -0.064094,
            -0.011844
          ],
          [
            -0.060625,
            -0.0145059
          ],
          [
            -0.0565852,
            -0.0161793
          ],
          [
            -0.05225,
            -0.01675
          ]
        ],
        "height": 0.048,
        "axis": "y"
      },
      "at": [
        0.0,
        0.004,
        0.0
      ],
      "source": "a6",
      "basis": [
        "body-outline"
      ],
      "note": "A5/A6/A9: rounded-ended shell under vulcanite. Curved plan and elevations inferred, not verified geometry."
    },
    {
      "id": "low-top-deck",
      "label": "Low Top Deck",
      "role": "mass",
      "stage": 2,
      "certainty": "inferred",
      "shape": {
        "type": "extrude",
        "profile": [
          [
            0.05225,
            -0.01675
          ],
          [
            0.0565852,
            -0.0161793
          ],
          [
            0.060625,
            -0.0145059
          ],
          [
            0.064094,
            -0.011844
          ],
          [
            0.0667559,
            -0.008375
          ],
          [
            0.0684293,
            -0.0043352
          ],
          [
            0.069,
            0.0
          ],
          [
            0.0684293,
            0.0043352
          ],
          [
            0.0667559,
            0.008375
          ],
          [
            0.064094,
            0.011844
          ],
          [
            0.060625,
            0.0145059
          ],
          [
            0.0565852,
            0.0161793
          ],
          [
            0.05225,
            0.01675
          ],
          [
            -0.05225,
            0.01675
          ],
          [
            -0.0565852,
            0.0161793
          ],
          [
            -0.060625,
            0.0145059
          ],
          [
            -0.064094,
            0.011844
          ],
          [
            -0.0667559,
            0.008375
          ],
          [
            -0.0684293,
            0.0043352
          ],
          [
            -0.069,
            0.0
          ],
          [
            -0.0684293,
            -0.0043352
          ],
          [
            -0.0667559,
            -0.008375
          ],
          [
            -0.064094,
            -0.011844
          ],
          [
            -0.060625,
            -0.0145059
          ],
          [
            -0.0565852,
            -0.0161793
          ],
          [
            -0.05225,
            -0.01675
          ]
        ],
        "height": 0.017,
        "axis": "y"
      },
      "at": [
        0.0,
        0.052,
        0.0
      ],
      "source": "a6",
      "basis": [
        "body-outline"
      ],
      "note": "A1/A5: lower deck for advance at viewer left and rewind recess at far right; fitted height69 mm."
    },
    {
      "id": "early-raised-finder-housing",
      "label": "Early Raised Finder Housing",
      "role": "identity",
      "stage": 2,
      "certainty": "inferred",
      "shape": {
        "type": "extrude",
        "profile": [
          [
            -0.018,
            -0.01675
          ],
          [
            0.053,
            -0.01675
          ],
          [
            0.055,
            -0.01475
          ],
          [
            0.055,
            0.01475
          ],
          [
            0.053,
            0.01675
          ],
          [
            -0.016,
            0.01675
          ],
          [
            -0.018,
            0.01475
          ]
        ],
        "height": 0.008,
        "axis": "y"
      },
      "at": [
        0.0,
        0.069,
        0.0
      ],
      "source": "a9",
      "basis": [
        "early-top",
        "body-outline"
      ],
      "note": "A9 first-batch stepped, slightly angular top silhouette; bevel vertices inferred from photograph."
    },
    {
      "id": "vulcanite-front-left",
      "label": "Vulcanite Front Left",
      "role": "structure",
      "stage": 1,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.048,
          0.047,
          0.0009
        ]
      },
      "at": [
        -0.043,
        0.0275,
        0.0167
      ],
      "source": "a5",
      "basis": [
        "body-outline"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "vulcanite-front-right",
      "label": "Vulcanite Front Right",
      "role": "structure",
      "stage": 1,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.036,
          0.047,
          0.0009
        ]
      },
      "at": [
        0.049,
        0.0275,
        0.0167
      ],
      "source": "a5",
      "basis": [
        "body-outline"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "rear-loading-panel",
      "label": "Rear Loading Panel",
      "role": "structure",
      "stage": 2,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.092,
          0.043,
          0.0014
        ]
      },
      "at": [
        0.0,
        0.027,
        -0.01715
      ],
      "source": "a7",
      "basis": [
        "rear-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "rear-panel-inset",
      "label": "Rear Panel Inset",
      "role": "detail",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.083,
          0.035,
          0.0008
        ]
      },
      "at": [
        0.0,
        0.027,
        -0.0181
      ],
      "source": "a7",
      "basis": [
        "rear-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "film-door-hinge",
      "label": "Film Door Hinge",
      "role": "structure",
      "stage": 2,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.00125,
        "height": 0.091,
        "segments": 40,
        "ribs": 4,
        "rings": 0
      },
      "at": [
        0.0455,
        0.049,
        -0.0178
      ],
      "source": "a7",
      "basis": [
        "rear-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        0,
        0,
        90
      ]
    },
    {
      "id": "film-reminder-rim",
      "label": "Film Reminder Rim",
      "role": "identity",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0125,
        "height": 0.001,
        "segments": 40,
        "ribs": 0,
        "rings": 0
      },
      "at": [
        0.0,
        0.027,
        -0.0184
      ],
      "source": "a7",
      "basis": [
        "rear-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        -90,
        0,
        0
      ]
    },
    {
      "id": "film-reminder-inner",
      "label": "Film Reminder Inner",
      "role": "detail",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0083,
        "height": 0.0007,
        "segments": 40,
        "ribs": 0,
        "rings": 0
      },
      "at": [
        0.0,
        0.027,
        -0.0194
      ],
      "source": "a7",
      "basis": [
        "rear-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        -90,
        0,
        0
      ]
    },
    {
      "id": "rangefinder-bezel",
      "label": "Rangefinder Bezel",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "tube",
        "path": [
          [
            -0.0361,
            0.0615,
            0.0175
          ],
          [
            -0.0281,
            0.0615,
            0.0175
          ],
          [
            -0.0271,
            0.0625,
            0.0175
          ],
          [
            -0.0271,
            0.0675,
            0.0175
          ],
          [
            -0.0281,
            0.0685,
            0.0175
          ],
          [
            -0.0361,
            0.0685,
            0.0175
          ],
          [
            -0.0371,
            0.0675,
            0.0175
          ],
          [
            -0.0371,
            0.0625,
            0.0175
          ],
          [
            -0.0361,
            0.0615,
            0.0175
          ]
        ],
        "radius": 0.00065,
        "sides": 6,
        "samples": 8,
        "smooth": false,
        "caps": true,
        "longitudinal": 2,
        "ring_every": 0
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a3",
      "basis": [
        "front-layout",
        "finder-outlines"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "rangefinder-glass",
      "label": "Rangefinder Glass",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.0076,
          0.0046,
          0.0007
        ]
      },
      "at": [
        -0.0321,
        0.065,
        0.0172
      ],
      "source": "a3",
      "basis": [
        "finder-outlines"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "look": {
        "fill": "glass"
      }
    },
    {
      "id": "rangefinder-inset",
      "label": "Rangefinder Inset",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.03562,
            0.062025,
            0.0179
          ],
          [
            -0.02858,
            0.062025,
            0.0179
          ],
          [
            -0.0277,
            0.062875,
            0.0179
          ],
          [
            -0.0277,
            0.067125,
            0.0179
          ],
          [
            -0.02858,
            0.067975,
            0.0179
          ],
          [
            -0.03562,
            0.067975,
            0.0179
          ],
          [
            -0.0365,
            0.067125,
            0.0179
          ],
          [
            -0.0365,
            0.062875,
            0.0179
          ]
        ],
        "closed": true,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a3",
      "basis": [
        "finder-outlines"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "frameline-illuminator-bezel",
      "label": "Frameline Illuminator Bezel",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "tube",
        "path": [
          [
            0.00185,
            0.0583,
            0.0175
          ],
          [
            0.01935,
            0.0583,
            0.0175
          ],
          [
            0.02035,
            0.0593,
            0.0175
          ],
          [
            0.02035,
            0.0743,
            0.0175
          ],
          [
            0.01935,
            0.0753,
            0.0175
          ],
          [
            0.00185,
            0.0753,
            0.0175
          ],
          [
            0.00085,
            0.0743,
            0.0175
          ],
          [
            0.00085,
            0.0593,
            0.0175
          ],
          [
            0.00185,
            0.0583,
            0.0175
          ]
        ],
        "radius": 0.00065,
        "sides": 6,
        "samples": 8,
        "smooth": false,
        "caps": true,
        "longitudinal": 2,
        "ring_every": 0
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a3",
      "basis": [
        "front-layout",
        "finder-outlines"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "frameline-illuminator-glass",
      "label": "Frameline Illuminator Glass",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.0171,
          0.0146,
          0.0007
        ]
      },
      "at": [
        0.0106,
        0.0668,
        0.0172
      ],
      "source": "a3",
      "basis": [
        "finder-outlines"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "look": {
        "fill": "glass"
      }
    },
    {
      "id": "frameline-illuminator-inset",
      "label": "Frameline Illuminator Inset",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            0.0029,
            0.059575,
            0.0179
          ],
          [
            0.0183,
            0.059575,
            0.0179
          ],
          [
            0.01918,
            0.060425,
            0.0179
          ],
          [
            0.01918,
            0.073175,
            0.0179
          ],
          [
            0.0183,
            0.074025,
            0.0179
          ],
          [
            0.0029,
            0.074025,
            0.0179
          ],
          [
            0.00202,
            0.073175,
            0.0179
          ],
          [
            0.00202,
            0.060425,
            0.0179
          ]
        ],
        "closed": true,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a3",
      "basis": [
        "finder-outlines"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "main-viewfinder-bezel",
      "label": "Main Viewfinder Bezel",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "tube",
        "path": [
          [
            0.0263,
            0.0573,
            0.0175
          ],
          [
            0.0473,
            0.0573,
            0.0175
          ],
          [
            0.0483,
            0.0583,
            0.0175
          ],
          [
            0.0483,
            0.0753,
            0.0175
          ],
          [
            0.0473,
            0.0763,
            0.0175
          ],
          [
            0.0263,
            0.0763,
            0.0175
          ],
          [
            0.0253,
            0.0753,
            0.0175
          ],
          [
            0.0253,
            0.0583,
            0.0175
          ],
          [
            0.0263,
            0.0573,
            0.0175
          ]
        ],
        "radius": 0.00065,
        "sides": 6,
        "samples": 8,
        "smooth": false,
        "caps": true,
        "longitudinal": 2,
        "ring_every": 0
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a3",
      "basis": [
        "front-layout",
        "finder-outlines"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "main-viewfinder-glass",
      "label": "Main Viewfinder Glass",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.0206,
          0.0166,
          0.0007
        ]
      },
      "at": [
        0.0368,
        0.0668,
        0.0172
      ],
      "source": "a3",
      "basis": [
        "finder-outlines"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "look": {
        "fill": "glass"
      }
    },
    {
      "id": "main-viewfinder-inset",
      "label": "Main Viewfinder Inset",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            0.02756,
            0.058725,
            0.0179
          ],
          [
            0.04604,
            0.058725,
            0.0179
          ],
          [
            0.04692,
            0.059575,
            0.0179
          ],
          [
            0.04692,
            0.074025,
            0.0179
          ],
          [
            0.04604,
            0.074875,
            0.0179
          ],
          [
            0.02756,
            0.074875,
            0.0179
          ],
          [
            0.02668,
            0.074025,
            0.0179
          ],
          [
            0.02668,
            0.059575,
            0.0179
          ]
        ],
        "closed": true,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a3",
      "basis": [
        "finder-outlines"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "rear-eyepiece",
      "label": "Rear Eyepiece",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0085,
            0.0
          ],
          [
            0.0085,
            0.0018
          ],
          [
            0.0075,
            0.0025
          ],
          [
            0.0058,
            0.0025
          ],
          [
            0.0058,
            0.0
          ],
          [
            0.0085,
            0.0
          ]
        ],
        "segments": 48,
        "meridians": 8
      },
      "at": [
        0.043,
        0.065,
        -0.0168
      ],
      "source": "a7",
      "basis": [
        "rear-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        -90,
        0,
        0
      ]
    },
    {
      "id": "rear-ocular-glass",
      "label": "Rear Ocular Glass",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0058,
        "height": 0.0006,
        "segments": 40,
        "ribs": 0,
        "rings": 0
      },
      "at": [
        0.043,
        0.065,
        -0.0186
      ],
      "source": "a7",
      "basis": [
        "rear-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        -90,
        0,
        0
      ],
      "look": {
        "fill": "glass"
      }
    },
    {
      "id": "flash-socket-1",
      "label": "Flash Socket 1",
      "role": "detail",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0046,
        "height": 0.002,
        "segments": 40,
        "ribs": 0,
        "rings": 1
      },
      "at": [
        0.015,
        0.065,
        -0.0168
      ],
      "source": "a7",
      "basis": [
        "rear-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        -90,
        0,
        0
      ]
    },
    {
      "id": "flash-socket-2",
      "label": "Flash Socket 2",
      "role": "detail",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0046,
        "height": 0.002,
        "segments": 40,
        "ribs": 0,
        "rings": 1
      },
      "at": [
        -0.002,
        0.065,
        -0.0168
      ],
      "source": "a7",
      "basis": [
        "rear-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        -90,
        0,
        0
      ]
    },
    {
      "id": "m-bayonet-flange",
      "label": "M Bayonet Flange",
      "role": "identity",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0265,
            0.0
          ],
          [
            0.0265,
            0.0025
          ],
          [
            0.0253,
            0.0032
          ],
          [
            0.0215,
            0.0032
          ],
          [
            0.0215,
            0.0
          ],
          [
            0.0265,
            0.0
          ]
        ],
        "segments": 48,
        "meridians": 8
      },
      "at": [
        0.0053,
        0.031,
        0.0168
      ],
      "source": "a5",
      "basis": [
        "front-layout",
        "lens-profile"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "fixed-distance-and-dof-ring",
      "label": "Fixed Distance And Dof Ring",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0252,
            0.0
          ],
          [
            0.0252,
            0.0044
          ],
          [
            0.0244,
            0.0052
          ],
          [
            0.0244,
            0.007
          ],
          [
            0.02,
            0.007
          ],
          [
            0.02,
            0.0
          ],
          [
            0.0252,
            0.0
          ]
        ],
        "segments": 48,
        "meridians": 8
      },
      "at": [
        0.0053,
        0.031,
        0.02
      ],
      "source": "a2",
      "basis": [
        "lens-profile"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "focus-ring",
      "label": "Focus Ring",
      "role": "structure",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0246,
            0.0
          ],
          [
            0.025,
            0.0006
          ],
          [
            0.025,
            0.0022
          ],
          [
            0.0238,
            0.0028
          ],
          [
            0.0167,
            0.0028
          ],
          [
            0.0167,
            0.0
          ],
          [
            0.0246,
            0.0
          ]
        ],
        "segments": 48,
        "meridians": 24
      },
      "at": [
        0.0053,
        0.031,
        0.027
      ],
      "source": "a2",
      "basis": [
        "lens-profile"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "telescoping-inner-barrel",
      "label": "Telescoping Inner Barrel",
      "role": "identity",
      "stage": 5,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.016,
            0.0
          ],
          [
            0.016,
            0.026
          ],
          [
            0.0151,
            0.026
          ],
          [
            0.0151,
            0.0
          ],
          [
            0.016,
            0.0
          ]
        ],
        "segments": 48,
        "meridians": 8
      },
      "at": [
        0.0053,
        0.031,
        0.00975
      ],
      "source": "a6",
      "basis": [
        "lens-profile",
        "lens-collapsed-length",
        "lens-extended-length"
      ],
      "note": "A6 and lens-spec: slender tube telescopes through fixed focus mount. Hidden rear length fitted; opening translates +14 mm.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "aperture-ring",
      "label": "Aperture Ring",
      "role": "identity",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.021,
            0.0
          ],
          [
            0.0215,
            0.0007
          ],
          [
            0.0215,
            0.0052
          ],
          [
            0.0205,
            0.006
          ],
          [
            0.0172,
            0.006
          ],
          [
            0.0172,
            0.0
          ],
          [
            0.021,
            0.0
          ]
        ],
        "segments": 48,
        "meridians": 8
      },
      "at": [
        0.0053,
        0.031,
        0.03475
      ],
      "source": "lens-photo",
      "basis": [
        "lens-profile"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "front-optical-head",
      "label": "Front Optical Head",
      "role": "identity",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0218,
            0.0
          ],
          [
            0.022,
            0.0008
          ],
          [
            0.022,
            0.005
          ],
          [
            0.0214,
            0.0058
          ],
          [
            0.0195,
            0.0058
          ],
          [
            0.0195,
            0.0048
          ],
          [
            0.017,
            0.0048
          ],
          [
            0.017,
            0.0
          ],
          [
            0.0218,
            0.0
          ]
        ],
        "segments": 48,
        "meridians": 8
      },
      "at": [
        0.0053,
        0.031,
        0.03975
      ],
      "source": "a2",
      "basis": [
        "lens-profile"
      ],
      "note": "A2/A6 and Leica Classic lens photo: stepped head; outer radius22 mm and internal profile inferred. Closed tip45.55 mm, open59.55 mm.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "lens-name-annulus",
      "label": "Lens Name Annulus",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0205,
        "height": 0.0006,
        "segments": 40,
        "ribs": 0,
        "rings": 0
      },
      "at": [
        0.0053,
        0.031,
        0.0443
      ],
      "source": "a2",
      "basis": [
        "lens-profile"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        90,
        0,
        0
      ],
      "look": {
        "fill": "none"
      }
    },
    {
      "id": "optical-element-1",
      "label": "Optical Element 1",
      "role": "identity",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0,
            0.0
          ],
          [
            0.01155,
            0.00015
          ],
          [
            0.0165,
            0.0007
          ],
          [
            0.01551,
            0.0014
          ],
          [
            0.010725,
            0.0016
          ],
          [
            0.0,
            0.0017
          ]
        ],
        "segments": 48,
        "meridians": 4
      },
      "at": [
        0.0053,
        0.031,
        0.0426
      ],
      "source": "section",
      "basis": [
        "optical-elements",
        "optical-groups",
        "optical-profile"
      ],
      "note": "Section diagram inferred curvature/spacing; schematic element 1. Not a measured optical prescription.",
      "rotate": [
        90,
        0,
        0
      ],
      "look": {
        "fill": "glass",
        "alpha": 0.75
      }
    },
    {
      "id": "optical-element-2",
      "label": "Optical Element 2",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0,
            0.0
          ],
          [
            0.0112,
            0.00015
          ],
          [
            0.016,
            0.0008
          ],
          [
            0.01504,
            0.0016
          ],
          [
            0.0104,
            0.0018
          ],
          [
            0.0,
            0.0019
          ]
        ],
        "segments": 48,
        "meridians": 4
      },
      "at": [
        0.0053,
        0.031,
        0.0404
      ],
      "source": "section",
      "basis": [
        "optical-elements",
        "optical-groups",
        "optical-profile"
      ],
      "note": "Section diagram inferred curvature/spacing; schematic element 2. Not a measured optical prescription.",
      "rotate": [
        90,
        0,
        0
      ],
      "look": {
        "fill": "glass",
        "alpha": 0.3
      }
    },
    {
      "id": "optical-element-3",
      "label": "Optical Element 3",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0,
            0.0
          ],
          [
            0.00889,
            0.00015
          ],
          [
            0.0127,
            0.00035
          ],
          [
            0.011938,
            0.0007
          ],
          [
            0.008255,
            0.0009
          ],
          [
            0.0,
            0.001
          ]
        ],
        "segments": 48,
        "meridians": 4
      },
      "at": [
        0.0053,
        0.031,
        0.0385
      ],
      "source": "section",
      "basis": [
        "optical-elements",
        "optical-groups",
        "optical-profile"
      ],
      "note": "Section diagram inferred curvature/spacing; schematic element 3. Not a measured optical prescription.",
      "rotate": [
        90,
        0,
        0
      ],
      "look": {
        "fill": "glass",
        "alpha": 0.3
      }
    },
    {
      "id": "optical-element-4",
      "label": "Optical Element 4",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0,
            0.0
          ],
          [
            0.00889,
            0.00015
          ],
          [
            0.0127,
            0.00035
          ],
          [
            0.011938,
            0.0007
          ],
          [
            0.008255,
            0.0009
          ],
          [
            0.0,
            0.001
          ]
        ],
        "segments": 48,
        "meridians": 4
      },
      "at": [
        0.0053,
        0.031,
        0.0378
      ],
      "source": "section",
      "basis": [
        "optical-elements",
        "optical-groups",
        "optical-profile"
      ],
      "note": "Section diagram inferred curvature/spacing; schematic element 4. Not a measured optical prescription.",
      "rotate": [
        90,
        0,
        0
      ],
      "look": {
        "fill": "glass",
        "alpha": 0.3
      }
    },
    {
      "id": "optical-element-5",
      "label": "Optical Element 5",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0,
            0.0
          ],
          [
            0.00861,
            0.00015
          ],
          [
            0.0123,
            0.00055
          ],
          [
            0.011562,
            0.0011
          ],
          [
            0.007995,
            0.0013
          ],
          [
            0.0,
            0.0014
          ]
        ],
        "segments": 48,
        "meridians": 4
      },
      "at": [
        0.0053,
        0.031,
        0.0359
      ],
      "source": "section",
      "basis": [
        "optical-elements",
        "optical-groups",
        "optical-profile"
      ],
      "note": "Section diagram inferred curvature/spacing; schematic element 5. Not a measured optical prescription.",
      "rotate": [
        90,
        0,
        0
      ],
      "look": {
        "fill": "glass",
        "alpha": 0.3
      }
    },
    {
      "id": "optical-element-6",
      "label": "Optical Element 6",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0,
            0.0
          ],
          [
            0.00728,
            0.00015
          ],
          [
            0.0104,
            0.0007
          ],
          [
            0.009776,
            0.0014
          ],
          [
            0.00676,
            0.0016
          ],
          [
            0.0,
            0.0017
          ]
        ],
        "segments": 48,
        "meridians": 4
      },
      "at": [
        0.0053,
        0.031,
        0.0314
      ],
      "source": "section",
      "basis": [
        "optical-elements",
        "optical-groups",
        "optical-profile"
      ],
      "note": "Section diagram inferred curvature/spacing; schematic element 6. Not a measured optical prescription.",
      "rotate": [
        90,
        0,
        0
      ],
      "look": {
        "fill": "glass",
        "alpha": 0.3
      }
    },
    {
      "id": "optical-element-7",
      "label": "Optical Element 7",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "lathe",
        "profile": [
          [
            0.0,
            0.0
          ],
          [
            0.0084,
            0.00015
          ],
          [
            0.012,
            0.00055
          ],
          [
            0.01128,
            0.0011
          ],
          [
            0.0078,
            0.0013
          ],
          [
            0.0,
            0.0014
          ]
        ],
        "segments": 48,
        "meridians": 4
      },
      "at": [
        0.0053,
        0.031,
        0.0286
      ],
      "source": "section",
      "basis": [
        "optical-elements",
        "optical-groups",
        "optical-profile"
      ],
      "note": "Section diagram inferred curvature/spacing; schematic element 7. Not a measured optical prescription.",
      "rotate": [
        90,
        0,
        0
      ],
      "look": {
        "fill": "glass",
        "alpha": 0.3
      }
    },
    {
      "id": "iris-blade-1",
      "label": "Iris Blade 1",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            0.0151,
            0.031,
            0.034
          ],
          [
            0.0112083,
            0.0337097,
            0.034
          ],
          [
            0.0103542,
            0.0350872,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "iris-blade-2",
      "label": "Iris Blade 2",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            0.0132284,
            0.0367603,
            0.034
          ],
          [
            0.0084872,
            0.036665,
            0.034
          ],
          [
            0.0069866,
            0.0372774,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "iris-blade-3",
      "label": "Iris Blade 3",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            0.0083284,
            0.0403204,
            0.034
          ],
          [
            0.0045487,
            0.0374564,
            0.034
          ],
          [
            0.0029747,
            0.0370699,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "iris-blade-4",
      "label": "Iris Blade 4",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            0.0022716,
            0.0403204,
            0.034
          ],
          [
            0.0008972,
            0.0357818,
            0.034
          ],
          [
            -0.000149,
            0.0345439,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "iris-blade-5",
      "label": "Iris Blade 5",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0026284,
            0.0367603,
            0.034
          ],
          [
            -0.0010726,
            0.0322806,
            0.034
          ],
          [
            -0.0011913,
            0.0306642,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "iris-blade-6",
      "label": "Iris Blade 6",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0045,
            0.031,
            0.034
          ],
          [
            -0.0006083,
            0.0282903,
            0.034
          ],
          [
            0.0002458,
            0.0269128,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "iris-blade-7",
      "label": "Iris Blade 7",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0026284,
            0.0252397,
            0.034
          ],
          [
            0.0021128,
            0.025335,
            0.034
          ],
          [
            0.0036134,
            0.0247226,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "iris-blade-8",
      "label": "Iris Blade 8",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            0.0022716,
            0.0216796,
            0.034
          ],
          [
            0.0060513,
            0.0245436,
            0.034
          ],
          [
            0.0076253,
            0.0249301,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "iris-blade-9",
      "label": "Iris Blade 9",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            0.0083284,
            0.0216796,
            0.034
          ],
          [
            0.0097028,
            0.0262182,
            0.034
          ],
          [
            0.010749,
            0.0274561,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "iris-blade-10",
      "label": "Iris Blade 10",
      "role": "detail",
      "stage": 6,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            0.0132284,
            0.0252397,
            0.034
          ],
          [
            0.0116726,
            0.0297194,
            0.034
          ],
          [
            0.0117913,
            0.0313358,
            0.034
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "section",
      "basis": [
        "diaphragm-blades",
        "optical-profile"
      ],
      "note": "Ten blades documented by lens-spec; individual outlines are schematic inferences, not traced blade engineering."
    },
    {
      "id": "infinity-lock-arm",
      "label": "Infinity Lock Arm",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "extrude",
        "profile": [
          [
            -0.018,
            -0.016
          ],
          [
            -0.024,
            -0.019
          ],
          [
            -0.027,
            -0.014
          ],
          [
            -0.025,
            -0.008
          ],
          [
            -0.02,
            -0.009
          ]
        ],
        "height": 0.002,
        "axis": "z"
      },
      "at": [
        0.0053,
        0.031,
        0.028
      ],
      "source": "a2",
      "basis": [
        "lens-profile"
      ],
      "note": "A2 triangular lower-left infinity-lock arm, fitted to fixed focusing ring."
    },
    {
      "id": "infinity-lock-button",
      "label": "Infinity Lock Button",
      "role": "detail",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.003,
        "height": 0.003,
        "segments": 40,
        "ribs": 0,
        "rings": 1
      },
      "at": [
        -0.019,
        0.016,
        0.0293
      ],
      "source": "a2",
      "basis": [
        "lens-profile"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "self-timer-lever",
      "label": "Self Timer Lever",
      "role": "identity",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "extrude",
        "profile": [
          [
            -0.005,
            -0.001
          ],
          [
            -0.004,
            -0.004
          ],
          [
            0.0,
            -0.005
          ],
          [
            0.004,
            -0.004
          ],
          [
            0.005,
            -0.001
          ],
          [
            0.004,
            0.003
          ],
          [
            0.002,
            0.017
          ],
          [
            0.0,
            0.019
          ],
          [
            -0.002,
            0.017
          ],
          [
            -0.004,
            0.003
          ]
        ],
        "height": 0.0018,
        "axis": "z"
      },
      "at": [
        -0.0449,
        0.022,
        0.0171
      ],
      "source": "a4",
      "basis": [
        "front-layout"
      ],
      "note": "A4 pear-shaped self-timer silhouette; paddle reaches y41 mm, pivot at22 mm. Inferred traced profile."
    },
    {
      "id": "timer-pivot",
      "label": "Timer Pivot",
      "role": "detail",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.004,
        "height": 0.0015,
        "segments": 40,
        "ribs": 0,
        "rings": 0
      },
      "at": [
        -0.0449,
        0.022,
        0.0188
      ],
      "source": "a4",
      "basis": [
        "front-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "timer-upper-button",
      "label": "Timer Upper Button",
      "role": "detail",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0025,
        "height": 0.001,
        "segments": 40,
        "ribs": 0,
        "rings": 0
      },
      "at": [
        -0.0449,
        0.039,
        0.0188
      ],
      "source": "a4",
      "basis": [
        "front-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "rewind-release-lever",
      "label": "Rewind Release Lever",
      "role": "detail",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "extrude",
        "profile": [
          [
            -0.0024,
            -0.001
          ],
          [
            -0.0015,
            -0.0025
          ],
          [
            0.0015,
            -0.0025
          ],
          [
            0.0024,
            -0.001
          ],
          [
            0.0018,
            0.008
          ],
          [
            0.0,
            0.0095
          ],
          [
            -0.0018,
            0.008
          ]
        ],
        "height": 0.0015,
        "axis": "z"
      },
      "at": [
        -0.0443,
        0.053,
        0.017
      ],
      "source": "a4",
      "basis": [
        "front-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "lens-release-button",
      "label": "Lens Release Button",
      "role": "detail",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0034,
        "height": 0.0025,
        "segments": 40,
        "ribs": 0,
        "rings": 1
      },
      "at": [
        -0.0255,
        0.0305,
        0.0172
      ],
      "source": "a4",
      "basis": [
        "front-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        90,
        0,
        0
      ]
    },
    {
      "id": "shutter-release-hub",
      "label": "Shutter Release Hub",
      "role": "identity",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.007,
        "height": 0.004,
        "segments": 40,
        "ribs": 0,
        "rings": 0
      },
      "at": [
        -0.0445,
        0.069,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "shutter-release-button",
      "label": "Shutter Release Button",
      "role": "detail",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0037,
        "height": 0.003,
        "segments": 40,
        "ribs": 0,
        "rings": 1
      },
      "at": [
        -0.0445,
        0.073,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "frame-counter-rim",
      "label": "Frame Counter Rim",
      "role": "detail",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0054,
        "height": 0.0013,
        "segments": 40,
        "ribs": 0,
        "rings": 0
      },
      "at": [
        -0.0592,
        0.069,
        0.002
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "frame-counter-face",
      "label": "Frame Counter Face",
      "role": "detail",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0044,
        "height": 0.0007,
        "segments": 40,
        "ribs": 0,
        "rings": 0
      },
      "at": [
        -0.0592,
        0.0703,
        0.002
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "early-shutter-speed-dial",
      "label": "Early Shutter Speed Dial",
      "role": "identity",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0081,
        "height": 0.005,
        "segments": 40,
        "ribs": 20,
        "rings": 1
      },
      "at": [
        -0.0182,
        0.069,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "rewind-knob",
      "label": "Rewind Knob",
      "role": "identity",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "cylinder",
        "radius": 0.0067,
        "height": 0.0072,
        "segments": 40,
        "ribs": 16,
        "rings": 1
      },
      "at": [
        0.061,
        0.069,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "metal-double-stroke-advance",
      "label": "Metal Double Stroke Advance",
      "role": "identity",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "extrude",
        "profile": [
          [
            -0.0445,
            -0.006
          ],
          [
            -0.039,
            -0.005
          ],
          [
            -0.035,
            -0.002
          ],
          [
            -0.031,
            0.003
          ],
          [
            -0.026,
            0.008
          ],
          [
            -0.023,
            0.011
          ],
          [
            -0.024,
            0.014
          ],
          [
            -0.027,
            0.014
          ],
          [
            -0.032,
            0.01
          ],
          [
            -0.038,
            0.005
          ],
          [
            -0.044,
            0.003
          ],
          [
            -0.049,
            0.003
          ],
          [
            -0.051,
            0.0
          ],
          [
            -0.049,
            -0.004
          ]
        ],
        "height": 0.0024,
        "axis": "y"
      },
      "at": [
        0.0,
        0.072,
        -0.003
      ],
      "source": "a9",
      "basis": [
        "early-advance",
        "top-layout"
      ],
      "note": "A9 curved tapered metal lever silhouette, no later plastic thumb tip. Closed/rest position; the two-stroke operating cycle is documented, not continuously motorized."
    },
    {
      "id": "cold-shoe-floor",
      "label": "Cold Shoe Floor",
      "role": "structure",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.018,
          0.0012,
          0.018
        ]
      },
      "at": [
        0.0019,
        0.0774,
        -0.006
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "cold-shoe-left-rail",
      "label": "Cold Shoe Left Rail",
      "role": "structure",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.002,
          0.0023,
          0.018
        ]
      },
      "at": [
        -0.0063,
        0.079,
        -0.006
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "cold-shoe-right-rail",
      "label": "Cold Shoe Right Rail",
      "role": "structure",
      "stage": 4,
      "certainty": "inferred",
      "shape": {
        "type": "box",
        "size": [
          0.002,
          0.0023,
          0.018
        ]
      },
      "at": [
        0.0101,
        0.079,
        -0.006
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented."
    },
    {
      "id": "left-strap-eye",
      "label": "Left Strap Eye",
      "role": "structure",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "tube",
        "path": [
          [
            -0.0679,
            0.044,
            -0.003
          ],
          [
            -0.072,
            0.05,
            -0.003
          ],
          [
            -0.073,
            0.054,
            -0.003
          ],
          [
            -0.071,
            0.057,
            -0.003
          ],
          [
            -0.068,
            0.056,
            -0.003
          ],
          [
            -0.0679,
            0.044,
            -0.003
          ]
        ],
        "radius": 0.00125,
        "sides": 6,
        "samples": 5,
        "smooth": false,
        "caps": true,
        "longitudinal": 2,
        "ring_every": 0
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a4",
      "basis": [
        "body-outline"
      ],
      "note": "A4/A8 elongated pierced early strap lug. Rounded tube is an inferred outline approximation to the forged bracket."
    },
    {
      "id": "right-strap-eye",
      "label": "Right Strap Eye",
      "role": "structure",
      "stage": 3,
      "certainty": "inferred",
      "shape": {
        "type": "tube",
        "path": [
          [
            0.0679,
            0.044,
            -0.003
          ],
          [
            0.072,
            0.05,
            -0.003
          ],
          [
            0.073,
            0.054,
            -0.003
          ],
          [
            0.071,
            0.057,
            -0.003
          ],
          [
            0.068,
            0.056,
            -0.003
          ],
          [
            0.0679,
            0.044,
            -0.003
          ]
        ],
        "radius": 0.00125,
        "sides": 6,
        "samples": 5,
        "smooth": false,
        "caps": true,
        "longitudinal": 2,
        "ring_every": 0
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a4",
      "basis": [
        "body-outline"
      ],
      "note": "A4/A8 elongated pierced early strap lug. Rounded tube is an inferred outline approximation to the forged bracket."
    },
    {
      "id": "speed-tick-0",
      "label": "Speed Tick 0",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0121,
            0.0741,
            0.0
          ],
          [
            -0.0109,
            0.0741,
            0.0
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "speed-tick-1",
      "label": "Speed Tick 1",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.013265,
            0.0741,
            0.0035855
          ],
          [
            -0.0122942,
            0.0741,
            0.0042908
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "speed-tick-2",
      "label": "Speed Tick 2",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.016315,
            0.0741,
            0.0058014
          ],
          [
            -0.0159442,
            0.0741,
            0.0069427
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "speed-tick-3",
      "label": "Speed Tick 3",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.020085,
            0.0741,
            0.0058014
          ],
          [
            -0.0204558,
            0.0741,
            0.0069427
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "speed-tick-4",
      "label": "Speed Tick 4",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.023135,
            0.0741,
            0.0035855
          ],
          [
            -0.0241058,
            0.0741,
            0.0042908
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "speed-tick-5",
      "label": "Speed Tick 5",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0243,
            0.0741,
            0.0
          ],
          [
            -0.0255,
            0.0741,
            0.0
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "speed-tick-6",
      "label": "Speed Tick 6",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.023135,
            0.0741,
            -0.0035855
          ],
          [
            -0.0241058,
            0.0741,
            -0.0042908
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "speed-tick-7",
      "label": "Speed Tick 7",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.020085,
            0.0741,
            -0.0058014
          ],
          [
            -0.0204558,
            0.0741,
            -0.0069427
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "speed-tick-8",
      "label": "Speed Tick 8",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.016315,
            0.0741,
            -0.0058014
          ],
          [
            -0.0159442,
            0.0741,
            -0.0069427
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "speed-tick-9",
      "label": "Speed Tick 9",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.013265,
            0.0741,
            -0.0035855
          ],
          [
            -0.0122942,
            0.0741,
            -0.0042908
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "counter-tick-0",
      "label": "Counter Tick 0",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0564,
            0.0711,
            0.002
          ],
          [
            -0.0552,
            0.0711,
            0.002
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "counter-tick-1",
      "label": "Counter Tick 1",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0572201,
            0.0711,
            0.0039799
          ],
          [
            -0.0563716,
            0.0711,
            0.0048284
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "counter-tick-2",
      "label": "Counter Tick 2",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0592,
            0.0711,
            0.0048
          ],
          [
            -0.0592,
            0.0711,
            0.006
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "counter-tick-3",
      "label": "Counter Tick 3",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0611799,
            0.0711,
            0.0039799
          ],
          [
            -0.0620284,
            0.0711,
            0.0048284
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "counter-tick-4",
      "label": "Counter Tick 4",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.062,
            0.0711,
            0.002
          ],
          [
            -0.0632,
            0.0711,
            0.002
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "counter-tick-5",
      "label": "Counter Tick 5",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0611799,
            0.0711,
            2.01e-05
          ],
          [
            -0.0620284,
            0.0711,
            -0.0008284
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "counter-tick-6",
      "label": "Counter Tick 6",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0592,
            0.0711,
            -0.0008
          ],
          [
            -0.0592,
            0.0711,
            -0.002
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "counter-tick-7",
      "label": "Counter Tick 7",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "curve",
        "points": [
          [
            -0.0572201,
            0.0711,
            2.01e-05
          ],
          [
            -0.0563716,
            0.0711,
            -0.0008284
          ]
        ],
        "closed": false,
        "smooth": false
      },
      "at": [
        0.0,
        0.0,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-layout"
      ],
      "note": "A9 observed engraved scale, evenly-spaced simplification; inferred tick positions."
    },
    {
      "id": "top-engraving-field",
      "label": "Top Engraving Field",
      "role": "detail",
      "stage": 7,
      "certainty": "inferred",
      "shape": {
        "type": "plane",
        "size": [
          0.047,
          0.025
        ]
      },
      "at": [
        0.028,
        0.07712,
        0.0
      ],
      "source": "a9",
      "basis": [
        "top-maker",
        "top-origin"
      ],
      "note": "Measured visual approximation; see research.md. No outline coordinates are documented.",
      "rotate": [
        -90,
        0,
        0
      ],
      "look": {
        "line": "none",
        "fill": "none"
      }
    }
  ],
  "presentation": {
    "framing": {
      "yaw": -27,
      "pitch": 19,
      "fit": 1.06
    },
    "views": [
      {
        "id": "open",
        "label": "Summicron deployed",
        "yaw": -32,
        "pitch": 15,
        "distance": 1.05
      },
      {
        "id": "finder",
        "label": "M3 three-window finder",
        "yaw": 8,
        "pitch": 7,
        "distance": 2.8,
        "target": "main-viewfinder-bezel"
      },
      {
        "id": "lens",
        "label": "Collapsible Summicron",
        "yaw": -20,
        "pitch": 12,
        "distance": 2,
        "target": "front-optical-head"
      },
      {
        "id": "controls",
        "label": "Early double-stroke controls",
        "yaw": 155,
        "pitch": 65,
        "distance": 1.08
      },
      {
        "id": "rear-detail",
        "label": "Film reminder and ocular",
        "yaw": 170,
        "pitch": 17,
        "distance": 1.05
      },
      {
        "id": "side-section",
        "label": "Collapsible lens profile",
        "yaw": 88,
        "pitch": 5,
        "distance": 1.03
      }
    ],
    "still_pose": "open",
    "atmosphere": {
      "haze": 0.15,
      "scanlines": false,
      "vignette": true,
      "grid": false,
      "projector": false,
      "motes": 0
    },
    "occlusion": "xray",
    "certainty_style": "subtle",
    "float": 0
  },
  "animation": {
    "assembly": {
      "style": "ceremony",
      "seconds": 9,
      "interference": false
    },
    "idle": {
      "life": "calm",
      "events": [
        "scan",
        "shimmer"
      ],
      "cadence": [
        12,
        21
      ],
      "strength": 0.22
    },
    "camera": {
      "drift": 2,
      "breathe": 0.012,
      "tour": [
        {
          "view": "lens",
          "at": 16,
          "fly": 3.5
        },
        {
          "view": "controls",
          "at": 25,
          "fly": 4
        },
        {
          "view": "rear-detail",
          "at": 34,
          "fly": 4
        },
        {
          "view": "hero",
          "at": 44,
          "fly": 5
        }
      ]
    },
    "reduced_motion": "still"
  },
  "assets": [],
  "labels": [
    {
      "id": "maker",
      "part": "top-engraving-field",
      "field": "top-maker",
      "face": "front",
      "region": [
        0.08,
        0.08,
        0.92,
        0.42
      ],
      "role": "title"
    },
    {
      "id": "origin",
      "part": "top-engraving-field",
      "field": "top-origin",
      "face": "front",
      "region": [
        0.03,
        0.55,
        0.97,
        0.95
      ],
      "role": "meta"
    },
    {
      "id": "lens-inscription",
      "part": "lens-name-annulus",
      "field": "lens",
      "face": "top",
      "region": [
        0.18,
        0.02,
        0.82,
        0.15
      ],
      "role": "meta"
    },
    {
      "id": "rear-asa",
      "part": "film-reminder-rim",
      "field": "film-reminder",
      "face": "top",
      "region": [
        0.2,
        0.76,
        0.8,
        0.94
      ],
      "role": "meta"
    }
  ],
  "articulations": [
    {
      "id": "extend-collapsible-summicron",
      "type": "slide",
      "parts": [
        "telescoping-inner-barrel",
        "aperture-ring",
        "front-optical-head",
        "lens-name-annulus",
        "optical-element-1",
        "optical-element-2",
        "optical-element-3",
        "optical-element-4",
        "optical-element-5",
        "optical-element-6",
        "optical-element-7",
        "iris-blade-1",
        "iris-blade-2",
        "iris-blade-3",
        "iris-blade-4",
        "iris-blade-5",
        "iris-blade-6",
        "iris-blade-7",
        "iris-blade-8",
        "iris-blade-9",
        "iris-blade-10"
      ],
      "axis": [
        0,
        0,
        1
      ],
      "amount": 0.014,
      "order": 0
    },
    {
      "id": "illustrative-lock-turn",
      "type": "turn",
      "parts": [
        "telescoping-inner-barrel",
        "aperture-ring",
        "front-optical-head",
        "lens-name-annulus",
        "optical-element-1",
        "optical-element-2",
        "optical-element-3",
        "optical-element-4",
        "optical-element-5",
        "optical-element-6",
        "optical-element-7",
        "iris-blade-1",
        "iris-blade-2",
        "iris-blade-3",
        "iris-blade-4",
        "iris-blade-5",
        "iris-blade-6",
        "iris-blade-7",
        "iris-blade-8",
        "iris-blade-9",
        "iris-blade-10"
      ],
      "axis": [
        0,
        0,
        1
      ],
      "pivot": [
        0.0053,
        0.031,
        0.04
      ],
      "amount": 12,
      "order": 1
    }
  ],
  "annotations": [
    {
      "id": "finder-note",
      "text": "Three-window M3 finder / outlines inferred",
      "part": "main-viewfinder-bezel",
      "offset": [
        0.01,
        0.012,
        0
      ]
    },
    {
      "id": "lens-note",
      "text": "Summicron 5 cm f/2 / 14 mm deployment inferred from 40–26 mm",
      "part": "front-optical-head",
      "offset": [
        0.009,
        -0.01,
        0.015
      ]
    },
    {
      "id": "motion-note",
      "text": "Manual pull-and-lock; opening choreography decorative",
      "part": "telescoping-inner-barrel",
      "offset": [
        -0.01,
        -0.02,
        0.01
      ]
    },
    {
      "id": "body-note",
      "text": "1954 double-stroke / no later frame selector",
      "part": "early-raised-finder-housing",
      "offset": [
        0,
        0.014,
        0
      ]
    }
  ],
  "anchors": {
    "front": {
      "part": "main-viewfinder-glass",
      "face": "front"
    },
    "base": {
      "point": [
        0,
        0,
        0
      ],
      "up": [
        0,
        1,
        0
      ]
    }
  }
}