Features:Lens mount adapter 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.