The Canon Mount Adapter EF-EOS R 0.71x is specifically designed to extend the range compatibility of lenses to fit on Canon RF-Mount camera bodies, while maintaining the original field of view.

The EF-EOS R 0.71x mount adapter from Canon simply allows you to attach EF-mount lenses to your RF-mount cine and mirrorless camera body. The EF-EOS R 0.71x mount adapter incorporates an optical system to increase the effective angle of view by 0.71x, reducing the effects of a full-frame to Super 35 crop factor, also increasing the maximum aperture performance by one stop. It also maintains its full communication between the camera and lens, and it also supports metadata transmission and use of Dual Pixel AF with select Canon EF lenses.