VILTROX EF-E II Auto Focus Booster Lens Adapter for Canon EF Lens to Sony E-Mount

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