{"lens":{"id":"micro-four-thirds","displayName":"Micro Four Thirds","manufacturer":"Olympus / OM System / Panasonic","flangeDistanceMm":19.25,"electronicProtocol":"Micro Four Thirds"},"body":{"id":"leica-m","displayName":"Leica M","manufacturer":"Leica","flangeDistanceMm":27.8,"electronicProtocol":"mechanical-only"},"compat":{"lensMountId":"micro-four-thirds","bodyMountId":"leica-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 -8.6 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":"MFT","bodyFormat":"full-frame","cropFactor":null,"message":"Lens image circle (MFT) is smaller than body sensor (full-frame) — expect heavy vignetting or black corners. Many bodies auto-crop to the smaller format and drop resolution accordingly."}}}