Fotasy AMEA Canon EOS Lens to Micro 4/3 MFT System Camera Mount Adapter with Built-In Aperture Ring Professional designed Canon EOS mount lens to MFT M4/3 Micro 4/3 camera adapter. Made of aluminum (camera body mount) anodized black, and brass (lens mount) chromed silver. With Built-In aperture control, It is a solution of using Canon EF lenses to adjust aperture in other cameras with external aperture ring. For bottom difference of Canon EF lens, this adapter isn't compatible with Canon EF S lens, such as: EF S 10-22mm; EF S 15-85mm; EF S 17-55mm; EF S 17-85mm; EF S 18-55mm; EF S 18-135mm; EF S 18-200mm; EF S 55-250mm; EF S 60mm We suggest Customers to rotate the ring from F2.8 to F22 to adjust the aperture ring in the adapter, if the position beyond 6, maybe dark area will be caused in the photos, for the reason that the aperture ring stay at the position is too small. Brand Name: Fotasy