Canon Will Announce An EF-EOS R 0.71x Speedbooster

Along with the leaked press release for the Canon EOS C70, there is another interesting information.

Canon will release their first speedbooster-like 0.71x adapter to mount EF lenses on EOS R bodies. It was rumored and a patent showed up too.

From the press release:

Also launching today is the Canon Mount Adapter EF-EOS R 0.71x – an EF Lens to RF Mount adapter giving filmmakers the freedom to use the entire EF lens line-up¹ with the EOS C70, optimising compatibility across two of Canon’s most popular lens lines. When paired with the EOS C70, the Mount Adapter EF-EOS R 0.71x employs an optical conversion to capture a Full Frame angle of view of an EF lens even when used with a Super 35mm sensor, as well as an increased light transmission of approximately 1-stop. The adapter enables full communication between three EF lenses and the camera body – EF 16-35mm f/2.8L III USM, EF 24-70mm f/2.8L II USM, and EF 24-105mm f/4L IS II USM- providing continued support for Canon’s extensive range of EF lenses². Auto Focus, peripheral illumination and chromatic aberration correction, and the transfer of lens metadata are also fully supported when using the Mount Adapter EF-EOS R 0.71x