{"lens":{"id":"canon-ef-s","displayName":"Canon EF-S","manufacturer":"Canon","flangeDistanceMm":44,"electronicProtocol":"Canon EF"},"body":{"id":"fujifilm-gfx","displayName":"Fujifilm GFX (G-mount)","manufacturer":"Fujifilm","flangeDistanceMm":26.7,"electronicProtocol":"Fujifilm G"},"compat":{"lensMountId":"canon-ef-s","bodyMountId":"fujifilm-gfx","feasibility":"mechanical","af":"partial","is":"lens-only","aperture":"electronic","infinityFocus":"yes","adapterExamples":["Fringer EF-GFX Pro","Steelsring EF-GFX"],"caveats":["Electronics pass through (AF on a curated lens list, electronic aperture), but an EF-S lens's APS-C image circle is far smaller than the 44×33 mm GFX sensor — usable only in a heavy central crop, so this pairing is of limited practical value.","Prefer full-frame EF glass for GFX; EF-S is mechanically possible but optically wasteful here."],"formatNote":{"match":"lens-smaller-than-body","lensFormat":"APS-C","bodyFormat":"medium-format","cropFactor":null,"message":"Lens image circle (APS-C) is smaller than body sensor (medium-format) — expect heavy vignetting or black corners. Many bodies auto-crop to the smaller format and drop resolution accordingly."}}}