{"lens":{"id":"ef-cine","displayName":"Canon EF (cine)","manufacturer":"Canon","flangeDistanceMm":44,"electronicProtocol":"Canon EF"},"body":{"id":"canon-ef-m","displayName":"Canon EF-M","manufacturer":"Canon","flangeDistanceMm":18,"electronicProtocol":"Canon EF-M"},"compat":{"lensMountId":"ef-cine","bodyMountId":"canon-ef-m","feasibility":"mechanical","af":"manual-only","is":"n/a","aperture":"electronic","infinityFocus":"yes","adapterExamples":["Canon EF-EOS M"],"caveats":["1.6× crop applies on every M-system body.","Cine prime keeps electronic aperture; AF is moot."],"formatNote":{"match":"lens-larger-than-body","lensFormat":"full-frame","bodyFormat":"APS-C","cropFactor":1.5,"message":"Lens covers full-frame; body is APS-C — 1.5× crop factor applies relative to the lens's native image circle. No vignetting; the body uses the centre of the lens."}}}