{"lens":{"id":"fujifilm-x","displayName":"Fujifilm X","manufacturer":"Fujifilm","flangeDistanceMm":17.7,"electronicProtocol":"Fujifilm X"},"body":{"id":"micro-four-thirds","displayName":"Micro Four Thirds","manufacturer":"Olympus / OM System / Panasonic","flangeDistanceMm":19.25,"electronicProtocol":"Micro Four Thirds"},"compat":{"lensMountId":"fujifilm-x","bodyMountId":"micro-four-thirds","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 -1.6 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-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."}}}