{"lens":{"id":"c-mount","displayName":"C-mount","manufacturer":"Various (cine / industrial standard)","flangeDistanceMm":17.526,"electronicProtocol":"mechanical-only"},"body":{"id":"canon-ef-m","displayName":"Canon EF-M","manufacturer":"Canon","flangeDistanceMm":18,"electronicProtocol":"Canon EF-M"},"compat":{"lensMountId":"c-mount","bodyMountId":"canon-ef-m","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 -0.5 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":"lens-smaller-than-body","lensFormat":"16mm-cine","bodyFormat":"APS-C","cropFactor":null,"message":"Lens image circle (16mm-cine) is smaller than body sensor (APS-C) — expect heavy vignetting or black corners. Many bodies auto-crop to the smaller format and drop resolution accordingly."}}}