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Related Questions and Answers

Q: 1. Can you tell me if the Extender EF-2x-iii is compatible with this adapter?

A: The Canon Extender EF 2X III along with a compatible Canon EF lens will work with the Canon Control Ring Mount Adapter EF-EOS R.

Q: 2. What is the difference between this ring and the adapter ring?

A: If comparing the Canon Control Ring Mount Adapter EF-EOS R B&H # CAMAEFRFCR to the Canon Mount Adapter EF-EOS R B&H # CAMAEFRF, the former model offers a control ring to allow the user to set various functions on the EOS R camera. Otherwise, both models allow for Canon EF and EF-S lenses to work on the EOS R with full autofocus.

Q: 3. When using this adapter with an ef-s lens, will there still be a 1.6 crop factor on the EOS R?

A: the crop factor is due to the sensor size is smaller than a typical full frame 35mm film size. when a lens is mounted on EOS R, which is a full frame camera, the crop factor is 1. i.e., a 50mm EF-S lens just have same image size as 50mm EF lens. however, since EF-S lenses are designed for smaller sensor, when mounted on full frame body the corners likely would have significant vignetting.

Q: 4. The instructions say to mount the lens first to the adapter then the adapter to the camera and when removing, first detach the adapter from the camera. Is there a problem leaving the adapter on the camera when changing EF lenses?

A: Thee could be. Please follow the mounting and dismounting procedure outlined by the manufacturer to avoid any damage.

Q: 5. Does it works with the EF-S Sigma 8-16?

A: According to Sigma, the Canon Control Ring Mount Adapter EF-EOS R will work with the Sigma 8-16mm lens but the camera’s “Scene Intelligent Auto mode” cannot be used. Also the 8-16mm is a crop sensor lens so the camera would need to be a crop sensor model such as the R10,m R50, R7, or if you are using a full frame, the camera would need to be set to crop mode.

Q: 6. does this adapter works with third party EF lenses like sigma art series or tamron?

A: Yes

Q: 7. Will this work on the RP

A: The Canon Control Ring Mount Adapter EF-EOS R, will work on the Canon RP camera.

Q: 8. Will this work with the Canon C70?

A: Yes, the Canon Control Ring Mount Adapter EF-EOS R is compatible for use with the Canon EOS C70 Cinema Camera.

Q: 9. I have a Canon EOS 5D Mark IV DSLR Camera, Will this adapter let me use the Canon RF 100mm f/2.8 L Macro IS USM Lens with it?

A: RF-mount lenses do not work on EF-mount camera bodies. The Canon Control Ring Mount Adapter EF-EOS R is meant to use older DSLR lenses on mirrorless camera bodies. Here is an EF-mount 100mm macro lens that would be fully compatible with your Canon 5D Mark IV: https://bhpho.to/3yxMIFh.

Q: 10. Will this work (including the control ring function) with the canon C400?

A: Yes, the Canon Control Ring Mount Adapter EF-EOS R is fully compatible with the Canon EOS C400 6K Full-Frame Digital Cinema Camera (Canon RF).