Viltrox EF-E II AF Booster Lens Adapter

Viltrox EF-E Il mount adapter is designed to allow Canon EF-mount lenses to be used on Sony E-mount APS-C cameras. Focal length is multiplied by 0.71 based on the original (equivalent length = focal length X0.71), which helps enlarge 3 level aperture. Itis also built in with 4 groups, 4 pcs optical glasses. By adapter mounting it can achieve functions of EXIF signal transmission, AF and adjustable aperture, etc. Firmware upgrades via the USB port.