EF to RF Adapter

Canon Mount Adapter EF-EOS R 0.71x

An EF to RF adapter to use the broad range of Canon EF lenses on the EOS C70 camera.


  • Magnification


  • Compact

    77.2 x 76.6 x 20.7mm Approx.

  • Lightweight


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Adapt EF lenses for use on RF Super 35mm System

The MOUNT ADAPTER EF-EOS R 0.71x is an EF to RF mount adapter for using the wide range of full frame Canon EF lenses on the EOS C70.
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Maintain full frame angle of view

The adapter gives the same angle of view when utilising full frame lenses on the Super 35mm sensor of the EOS C70, by adapting the focal length by a factor of 0.71x from full frame format to Super 35mm format.
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One stop brighter

By reducing the focal length of the lens, MOUNT ADAPTER EF-EOS R 0.71x increases light transmission, effectively increasing the f/stop value of a lens. For example, an F2.8 lens becomes approximately F2.0, for low-light shooting and lower signal noise.
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Superior communication between lens and body

Full communication between EF lenses and the camera body is maintained, with support for Dual Pixel CMOS AF1, as well as peripheral illumination and chromatic aberration correction. The adapter also transmits information from the lens, and is displayed on screen (F value, focal length and lens metadata are supported).
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No compromise construction

Designed for reliability and durability, the included locking plates secure the adaptor to the body with four screws. Shoot with confidence even when using large and heavy lenses.

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EOS C70 whats in the box

What's in the box


  • 2 x Locking Support Plates & 4 x Screws


As of July 2020, the following Canon EF lenses are fully compatible with the EF-EOS R 0.71x Mount Adapter. These lenses allow for full optical correction, auto focus and metadata compatibility with the EOS C70.

Canon Mount Adapter EF-EOS R 0.71x
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  1. All data is based on Canon standard testing methods except where indicated. Subject to change without notice.