Viltrox EF-E II Speed Booster (Focal Reducer)

This adapter is designed for Sony E mount APS-C camera and Canon EF mount lenses,Support Sony A9/A7/A7R/A7S/A6XXX/NEX cameras and VG camcorders* (APS-C mode should be turn on for full frame camera) 4 elements in 4 groups optics increase light input by one F stop and reduce focal length by x0.71, increase the lens 3 f-stop, increasing the amount of light, can better virtual background 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 Support on camera aperture adjustment and metering, Record EXIF data includes aperture, focal distance etc Please notice : It works with the Canon EF mount lens only , NOT EF-S mount , and if your camera is full frame camera , please set it as "APS-C" before use it