The Viltrox EF-EOS M2 is a lens adapter. It will allow you to use your Canon EF lenses on Canon EOSM hybrid cameras equipped with the EOSM mount. The adapter allows you to keep autofocus as well as control of the aperture and transmission of EXIF. The focal length of your lens will be multiplied by 0.71. In addition, you gain 1 aperture diaphragm.