VILTROX EF-E II Speed Booster 0.71x Auto Focus Lens Adapter for Canon EF Lens to Sony E-Mount Camera a9 a7r iii a7r ii a7iii a7s a6500 a6300 VILTROX EF-E II Electronic Adapter (F Booster) only for Canon EF lens, not for EF-S lens . Reduced imaging focal length, the actual focal length after using EF-E for 0.71 times the focal length.Also compatible with full frame camera , just please turn on the APS-C Mode firstly . Dedicated switch to select between Contrast Detection and Phase Detection Auto Focus mode . CDAF allow Flexible Spot to be moved and focus across the frame and support Eye focus on specific camera . PDAF gives faster focus experience on most lenses. With USB port firmware update . latest firmware can be download from official website, connect adapter to computer with USB cable and copy the file into adapter memory. Do not required to attach lens or camera. Ring at the bottom with 1/4 screws, which can easy installed on the tripod or other fixed bracket.