{"lens":{"id":"olympus-om","displayName":"Olympus OM","manufacturer":"Olympus","flangeDistanceMm":46,"electronicProtocol":"mechanical-only"},"body":{"id":"micro-four-thirds","displayName":"Micro Four Thirds","manufacturer":"Olympus / OM System / Panasonic","flangeDistanceMm":19.25,"electronicProtocol":"Micro Four Thirds"},"compat":{"lensMountId":"olympus-om","bodyMountId":"micro-four-thirds","feasibility":"mechanical","af":"n/a","is":"n/a","aperture":"manual-ring","infinityFocus":"yes","adapterExamples":["Olympus MMF-3 (weather-sealed first-party)","Fotodiox Pro OM-MFT","K&F Concept OM-M43","Urth OM to Micro Four Thirds Adapter"],"caveats":["26.75 mm flange clearance — generous adapter thickness; every Zuiko OM lens hits infinity without optical correction.","Every Zuiko OM lens is manual-focus with a mechanical aperture ring. Stop-down metering and focus-confirm work on the body's EVF; autofocus, electronic aperture, and IS pass-through are not available (no electrical contacts).","MFT's 2× crop factor doubles every focal length — a 50 mm Zuiko becomes a 100 mm-equivalent FOV, a 24 mm becomes 48 mm."],"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."}}}