{"lens":{"id":"praktica-b","displayName":"Praktica B","manufacturer":"VEB Pentacon","flangeDistanceMm":44.4,"electronicProtocol":"mechanical-only"},"body":{"id":"konica-ar","displayName":"Konica AR","manufacturer":"Konica","flangeDistanceMm":40.5,"electronicProtocol":"mechanical-only"},"compat":{"lensMountId":"praktica-b","bodyMountId":"konica-ar","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 Konica AR body."],"formatNote":{"match":"match","lensFormat":"full-frame","bodyFormat":"full-frame","cropFactor":null,"message":"Lens image circle (full-frame) matches body sensor (full-frame) — no crop or vignetting concern."}}}