{"lens":{"id":"canon-ef-s","displayName":"Canon EF-S","manufacturer":"Canon","flangeDistanceMm":44,"electronicProtocol":"Canon EF"},"body":{"id":"l-mount","displayName":"L-Mount","manufacturer":"Leica / Panasonic / Sigma","flangeDistanceMm":20,"electronicProtocol":"L-Mount"},"compat":{"lensMountId":"canon-ef-s","bodyMountId":"l-mount","feasibility":"mechanical","af":"full","is":"full","aperture":"electronic","infinityFocus":"yes","adapterExamples":["Sigma MC-21 EF-L"],"caveats":["The MC-21 accepts EF and EF-S alike and passes AF, IS and electronic aperture; Sigma's own EF lenses have the widest supported list.","EF-S's APS-C image circle is native on an APS-C L body (Leica CL / TL2); on a full-frame L body (SL2, Panasonic S5 II) stay in APS-C crop mode to avoid vignetting."],"formatNote":{"match":"lens-smaller-than-body","lensFormat":"APS-C","bodyFormat":"full-frame","cropFactor":null,"message":"Lens image circle (APS-C) is smaller than body sensor (full-frame) — expect heavy vignetting or black corners. Many bodies auto-crop to the smaller format and drop resolution accordingly."}}}