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. By adapter mounting it can achieve functions of EXIF signal transmission, AF(autofocus) and adjustable aperture,etc. Firmware upgrade is via the USB port.
EF-EOS M2 adapter mount
Canon EF series lenses
Interchangeable-lens digital cameras that
are compatible with Canon EF-M lenses
Focal Lenth Multiplier
4 groups, 4 glasses
USB upgrade port
Diameter and Length
Approx. 145 g (excluding cap)
Lens Dust cap