{"lens":{"id":"praktica-b","displayName":"Praktica B","manufacturer":"VEB Pentacon","flangeDistanceMm":44.4,"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":"praktica-b","bodyMountId":"micro-four-thirds","feasibility":"mechanical","af":"n/a","is":"n/a","aperture":"manual-ring","infinityFocus":"yes","adapterExamples":["generic mechanical adapter ring (multiple vendors)"],"caveats":["Mechanical adapter only — no electronic communication between Praktica B lens and Micro Four Thirds body."],"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."}}}