Canon has released an EF-EOS R 0.71x mount adapter for the EOS C70 cinema camera, the first in the Cinema EOS family to use an RF mount. This camera can be used in conjunction with EF lenses , providing an angle of view similar to that of full-frame lenses. This allows users to take full advantage of the wide range of EF lenses. As well as expanding the possibilities and flexibility of video creation.
With the EF-EOS R mount adapter’s miniaturized optics system, the EOS C70, which uses a Super-35mm DGO sensor, can record video using EF lenses designed for full-frame sensors. It also provides a 0.7 times wider viewing angle, which is the same perspective as a full-frame lens. Also reducing the size of this optical system It also increases the brightness of the image by approximately 1 stop (increases the aperture of the “f-number” lens by 1 stop), allowing a lower sensitivity to be used. Allows you to shoot high-quality videos with low noise. Even in low-light environments such as indoors or at night.
When the EOS C70 movie camera is attached to an EF lens  using the EF-EOS R 0.71x mount adapter, the camera’s Dual Pixel CMOS AF can be used to its full potential across the entire image. Digital movie cameras with EF mountable cameras can also record and display information such as peripheral illumination correction, lateral chromatic aberration correction, aperture value and length.