{"lens":{"id":"canon-fd","displayName":"Canon FD","manufacturer":"Canon","flangeDistanceMm":42,"electronicProtocol":"mechanical-only"},"body":{"id":"pl","displayName":"PL (Positive Lock)","manufacturer":"Arri (industry standard)","flangeDistanceMm":52,"electronicProtocol":"mechanical-only"},"compat":{"lensMountId":"canon-fd","bodyMountId":"pl","feasibility":"requires-glass","af":"manual-only","is":"lens-only","aperture":"adapter-wheel","infinityFocus":"requires-correction","adapterExamples":["Speed Booster / focal-reducer family"],"caveats":["Flange clearance is only -10.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required.","Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies."],"formatNote":{"match":"match","lensFormat":"full-frame","bodyFormat":"full-frame","cropFactor":null,"message":"Lens image circle (full-frame) matches body sensor (full-frame) — no crop or vignetting concern."}}}