Mount adapter required when mounting EF/EF-S lenses on EOS R series cameras. It adopts a fully electronic bayonet and supports the autofocus, hand-shake compensation and other functions of EF/EF-S lenses. It has a waterproof and dustproof structure, and both the camera and lens mounts are made of metal, which improves reliability. ・Dimensions (diameter x thickness): approx. 71.2 x 24 mm ・Weight: Approximately 110 grams (only the product itself) ※Depending on camera specifications, some EF lens functions may not be available. ※The minimum focusing distance, maximum magnification and angle of view of the installed lens will change slightly after the adapter. ※Although this mechanism has certain waterproof performance, please try not to get wet when shooting on rainy days.