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Features: • 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.