EF-EOS R is the lens adapter for Canon EF/EF-S lenses to Canon EOS R series cameras. It has metal electrical contact pins which is auto focus. The control loop is integrated on the adapter ring which can achieve the same operational feel as the RF lens control ring when connect to lens. Inbuilt metal contacts, accurate focus. Perfect suitable for EF/EF-S lenses to EOS R series cameras. Achieve EXIF signal transmission. Fine workmanship, bayonet is closely connected with lens and camera. Bayonet is made of metal with surface plating treatment, being sturdy and durable. EF-EOS R is the lens adapter for Canon EF/EF-S series lens to be perfectly mounted for Canon EOS R series cameras. When using EF lens, the focal length is equal to the original focal length; When using EF-S lens, the picture will be intercepted automatically, focal length changed to 1.6 times of original focal length. Compatible for Canon EOS R full-pixel dual-core focusing technology, large focusing coverage area, focusing speed is fast and accuracy is high. EF-EOSR adapter ring has built-in metal contacts and data chips; You can quickly and effectively adjust the aperture on the camera and greatly improve the convenience. Adopting gold-plated copper electronic contacts, it can enhance the data transmission performance between the lens and the camera, you can view shutter, aperture, ISO and other information parameters on the camera end. Support EXIF information transmission. Support lens shake-proof.