Features:Lens adapter for Canon EF series lens to use for Sony E-mount (APS-C) series cameras.Auto focus, support CDAF and PDAF, your focusing process can be quicker or easier.0.71x multiply the original focal length, which help to accelerate focusing speed by 50%. Built-in 4 groups 4 glasses optical glass, aperture is increased by 3 stops, so you can better distinguish the main object and blur out background.Gold-plated copper contact enhance EXIF signal transmission.Support USB upgrade for sustainable usage.CNC precision constructed aluminum body ensure perfect installation.