{"lens":{"id":"fujifilm-gfx","displayName":"Fujifilm GFX (G-mount)","manufacturer":"Fujifilm","flangeDistanceMm":26.7,"electronicProtocol":"Fujifilm G"},"body":{"id":"leica-m","displayName":"Leica M","manufacturer":"Leica","flangeDistanceMm":27.8,"electronicProtocol":"mechanical-only"},"compat":{"lensMountId":"fujifilm-gfx","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 -1.1 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-larger-than-body","lensFormat":"medium-format","bodyFormat":"full-frame","cropFactor":1.27,"message":"Lens covers medium-format; body is full-frame — 1.27× crop factor applies relative to the lens's native image circle. No vignetting; the body uses the centre of the lens."}}}