{"lens":{"id":"ef-cine","displayName":"Canon EF (cine)","manufacturer":"Canon","flangeDistanceMm":44,"electronicProtocol":"Canon EF"},"body":{"id":"micro-four-thirds","displayName":"Micro Four Thirds","manufacturer":"Olympus / OM System / Panasonic","flangeDistanceMm":19.25,"electronicProtocol":"Micro Four Thirds"},"compat":{"lensMountId":"ef-cine","bodyMountId":"micro-four-thirds","feasibility":"mechanical","af":"manual-only","is":"n/a","aperture":"electronic","infinityFocus":"yes","adapterExamples":["Metabones EF-MFT Speed Booster XL (0.64× focal reducer, electronic)","Viltrox EF-M2 II (0.71× focal reducer, electronic)"],"caveats":["Smart EF-MFT adapters carry the EF 8-pin protocol and pass a CN-E prime's electronic iris; the Metabones EF-MFT Speed Booster XL and Viltrox EF-M2 II are focal reducers that also widen the field of view back toward Super35 and add roughly a stop.","On a straight (non-reducing) adapter the 2× crop turns a CN-E 50 into a ~100 mm-equivalent and a CN-E 85 into ~170 mm — a tele-leaning kit; the focal reducer is what restores wider framing.","No autofocus (CN-E has no motor) and no in-lens IS — rely on body IBIS where the camera has it (Panasonic GH7 / GH6); the BMPCC 4K has no IBIS, so rig or gimbal."],"formatNote":{"match":"lens-larger-than-body","lensFormat":"full-frame","bodyFormat":"MFT","cropFactor":2,"message":"Lens covers full-frame; body is MFT — 2× crop factor applies relative to the lens's native image circle. No vignetting; the body uses the centre of the lens."}}}