Canon Mount Adapter EF-EOS R 0.71x

The Canon Mount Adapter EF-EOS R 0.71x is a professional lens mount adapter designed to expand lens compatibility by allowing Canon EF-mount lenses to be used with compatible RF-mount cinema and mirrorless cameras. Designed especially for cameras with a Super 35 sensor, the adapter helps maintain the original field of view of full-frame EF lenses while providing greater flexibility for professional cinema and video production.

Unlike a conventional lens mount adapter, the EF-EOS R 0.71x incorporates an integrated optical system that increases the effective angle of view by 0.71x. This helps reduce the crop normally experienced when using a full-frame EF lens on a Super 35 sensor, allowing cinematographers to achieve a field of view closer to the lens's original full-frame perspective.

The optical design also improves maximum aperture performance by approximately one stop, providing increased light transmission when shooting with compatible EF lenses. This can be especially useful for low-light production and situations where maintaining a shallower depth of field or maximizing available light is important.

Built-in electronic contacts maintain communication between compatible Canon EF lenses and the camera. This enables supported functions including lens metadata transmission and Dual Pixel autofocus with select Canon EF lenses, helping retain important electronic functionality while adapting lenses to an RF-mount camera.

The adapter has been specifically designed for use with the Canon EOS C70 cinema camera. For a secure professional installation, it includes four screws and a split locking collar that help firmly attach the adapter to the camera, providing additional stability when working with professional EF lenses.

The Canon Mount Adapter EF-EOS R 0.71x physically supports Canon EF-mount lenses, while select lenses provide enhanced electronic compatibility, including full Dual Pixel autofocus support and metadata communication.

Compatible Canon EF Lenses with Enhanced Support

• Canon EF 16-35mm f/2.8L III USM

• Canon EF 24-70mm f/2.8L II USM

• Canon EF 24-105mm f/4L IS II USM

If you're building or expanding a professional Canon cinema setup, explore more Canon products from Systec International, including cinema cameras, professional lenses, lens adapters, broadcast equipment, and other video production accessories.

Frequently Asked Questions

What is the Canon Mount Adapter EF-EOS R 0.71x?

The Canon Mount Adapter EF-EOS R 0.71x is a professional EF-to-RF lens mount adapter with an integrated 0.71x optical system. It allows compatible Canon EF lenses to be used with RF-mount cameras featuring a Super 35 sensor.

What does the 0.71x optical system do?

The integrated optical system increases the effective angle of view by 0.71x, helping reduce the crop factor that normally occurs when using full-frame EF lenses on a Super 35 sensor.

Does the Canon EF-EOS R 0.71x increase lens brightness?

Yes. The adapter can improve maximum aperture performance by approximately one stop, allowing more light to reach the camera sensor.

Is the Canon EF-EOS R 0.71x designed for the EOS C70?

Yes. The adapter was specifically designed for the Canon EOS C70 cinema camera and includes a secure locking system for professional use.

Does the Canon EF-EOS R 0.71x support autofocus?

Yes, select compatible Canon EF lenses support Dual Pixel autofocus when used with the adapter and a compatible camera.

Does the adapter transmit lens metadata?

Yes. Its built-in electronic contacts maintain communication between compatible lenses and the camera, including supported lens metadata transmission.

Can I use any Canon EF lens with the adapter?

The adapter physically supports Canon EF-mount lenses. However, advanced electronic functions such as Dual Pixel autofocus and metadata transmission are supported only with compatible lenses.

Which Canon EF lenses support enhanced compatibility?

Supported examples include the 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.

Does the adapter help maintain the original lens field of view?

Yes. Its 0.71x optical system helps compensate for the difference between a full-frame lens and a Super 35 sensor, allowing the lens to retain a field of view much closer to its original full-frame perspective.

How is the adapter secured to the Canon EOS C70?

The adapter includes four screws and a split locking collar, helping provide a stable and secure connection for professional cinema production.