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FIELD MANUAL — INTERCHANGEABLE-LENS CAMERAS · SIX ASSEMBLIES · 77 PARTS
Pick a body, mount a lens, then pull the lens apart. Every model below was
built procedurally in Blender, exported as GLB, and drawn by a
line-art renderer in your browser — flat paper fills, true silhouettes, and
feature edges, like a service manual that learned to move. Every part is real:
hover or tap them to learn what they do.
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OPTICS
A photographic lens is a stack of curved glass elements, grouped so their errors cancel. Convex surfaces converge light; concave surfaces correct the overshoot — chromatic fringing, field curvature, distortion. More glass usually buys fewer compromises, which is why the fast 85 carries twice the weight of the 50.
MECHANICS
Between the groups sits a diaphragm of overlapping blades. Close it and you trade light for depth of field; the blade count and curvature decide how out-of-focus highlights render — the geometry you see in bokeh is literally this part's outline.
ELECTRONICS
The bayonet's gold contacts carry power and a protocol: aperture commands go in, focus positions come back, dozens of times a second. Autofocus is a ring motor spinning glass by wire. This is why adapting lenses across systems is mostly a conversation problem, not a mechanical one.
BODIES
The DSLR bounces the image off a 45° mirror into a pentaprism — optical, zero-lag, but bulky. The rangefinder never looks through the lens at all; you focus by aligning a ghost patch. The mirrorless deletes both and reads the sensor directly. Same mount idea, three different machines.