1、The adapter ring is made of aluminum alloy and refined copper, and the slip pattern is made by CNC machine tools, good feel. 2、The electronic lens adapter ring can connect for Canon EF/EF‑S series lens to fit for Canon EOS M series camera body, can realize controllable aperture and high‑speed auto focus, very convenient for photographers and video users who need lens adapter. 3、Support auto focus and lens anti‑shake, fast and stable focus function. 4、The inner wall is matted to absorb the radiated light efficiently, and the interface is tight without stray light, flare, and light leakage. 5、The bottom bracket can be removed freely, easy to install and use, universal 1/4 inch screw hole, strong compatibility. Item type: Adapter Ring Material: Aluminum alloy + refined copper Color: black Weight: Approx. 155g Focus mode: auto focus Compatible lens: for EF/EF-S mount series lens Compatible camera: for Canon EOS M mount series camera The outer diameter of the camera end: Approx. 45mm/1.8in The outer diameter of the lens end: Approx. 67mm/2.6in Length: Approx. 83mm/3.3in 1 x Adapter Ring 1 x Instruction Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia