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Canon Will Announce An EF-EOS R 0.71x Speedbooster

Speedbooster
The Metabones 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

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