K&F Concept Lens Mount Adapter for Canon EOS EF mount Lens to M4/3 MFT Olympus PEN and Panasonic Lumix Cameras Smooth surface for effortless mount,infinity focus allowed.The adapters are precision made to insure the perfect fit. Made of brass and aluminum (not plastic), anodized aluminum construction. Compatible Cameras (Including, but not limited to): Olympus PEN E-PL1, E-PL1s, E-PL2, E-PL3, E-P2, E-P3, E-M, OM-D, E-M5, E-M10, Panasonic Lumix DMC-G1, G2, G3, G10, GX1, GH1, GH2, GF1, GF2, GF3, GF5, GH4, Panasonic AG-AF100 Mirrorless Digital Cameras, Black Magic Pocket Cinema Camera (BMPCC). As Canon's EOS lenses are electronically controlledmost Canon EF mount lenses do not feature a manual aperture ringso when used on our EOS-M4/3, which is a full manual operation adapter ring, the aperture could not be transfered to the camera, it will stop down to its smallest f/stop by default. Adapting full-frame lens to APS-frame or M4/3 frame camera it will magnify the focal length by 1.6 on Canon, 1.5 on Nikon and Sony2.0 on M4/3 camera