Viltrox EF-EOS M2 mount is designed to allow Canon EF-mount series lenses to be used on interchangeable-lens digital cameras that compatible with EF-M lens. Features: Lens mount adapter Replacement for Canon EF-mount series lenses to Canon EOS EF-M mirroless cameras. Focal length is multiplied by 0.71 based on the original (equivalent focal length = focal length x 0.71), which helps enlarge 1 level aperture. By adapter mounting it can achieve functions of EXIF signal transmission, AF(autofocus) and adjustable aperture,etc. Built in 4 groups,4pcs optical glasses; supports firmware upgrade via the USB port. Zinc alloy material, durable and sturdy; with 1/4 inch screw hole at the bottom, can be installed on the tripod or other fixed bracket easily. Specifications: Compatible Lenses: for Canon EF series lenses Compatible Cameras: interchangeable-lens digital cameras that compatible with EF-M lens Focus Mode: Auto Focus Focal Length Multiplier: 0.71X Optical Glasses: 4 groups, 4 glasses Firmware Upgrade: USB upgrade port Item Weight: 145g / 5.1oz(excluding caps) Package Size: 11 * 10.5 * 6cm / 4.3 * 4.1 * 2.4in Package Weight: 280g / 9.9oz Note: This lens mount adapter is not compatible with EF-S mount lenses. Package List: 1 * Lens Mount Adapter with caps 1 * Users Manual(English & Chinese)