The Viltrox EF-EOS M2 mount adapter is a lens adapter that is designed for use on the Canon cameras with EF-M lens mount to allow the use of the vast variety of Canon EF-mount series lenses. The 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. It is also built in 4 groups, 4pcs optical glasses.
With auto focus function - you can increase the lens stop 3, increasing the amount of light on the virtual background, you can better highlight the subject. By adapter mounting it can achieve functions of EXIF signal transmission, AF (autofocus) and adjustable aperture, etc. Firmware upgrade is via the USB port. It is made of strong zinc alloy, hence, it is stable and reliable.