{"lens":{"id":"canon-ef-s","displayName":"Canon EF-S","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":"canon-ef-s","bodyMountId":"micro-four-thirds","feasibility":"mechanical","af":"partial","is":"full","aperture":"electronic","infinityFocus":"yes","adapterExamples":["Viltrox EF-M2 II (0.71× focal reducer, electronic)","Metabones EF-MFT Speed Booster / Smart Adapter"],"caveats":["EF-S is electronically EF, so the same smart EF-MFT adapters pass aperture / IS and drive contrast-detect AF on EF-S glass (partial — usable but slower than native).","The Micro Four Thirds sensor is smaller than EF-S's APS-C image circle, so coverage is never an issue; a focal-reducer variant restores reach and a stop of light."],"formatNote":{"match":"lens-larger-than-body","lensFormat":"APS-C","bodyFormat":"MFT","cropFactor":1.33,"message":"Lens covers APS-C; body is MFT — 1.33× crop factor applies relative to the lens's native image circle. No vignetting; the body uses the centre of the lens."}}}