Canon Canon Lens Adapter Canon Mount Adapter EF-EOS R

Connect EF-mount lenses to EOS R system cameras using the Lens Adapter Canon Mount Adapter EF-EOS R. Designed to preserve the performance and electronic communication of EF lenses when mounted on RF-mount bodies, this adapter measures 24 mm in length, weighs 110 g and has a black finish. The adapter is weather-sealed against dust and moisture to support outdoor and location work while retaining autofocus and exposure control between lens and camera.

Advantages

The adapter maintains full electronic communication between lens and camera for autofocus, image stabilisation (if present in the lens), aperture control and EXIF transmission. Its compact and lightweight design (24 mm length, 0.11 kg) keeps handling balanced and minimizes additional bulk on the camera. Weather-sealing helps protect the connection from dust and moisture during field use.

Suitable for

• Photographers who want to use Canon EF lenses on EOS R / RF-mount cameras
• Location and outdoor shooting where weather resistance is beneficial
• Users preserving lens collections while switching to mirrorless EOS R bodies
• Situations requiring maintained autofocus and electronic controls

Key specifications

• Mount compatibility: Canon EF to Canon RF (EOS R)
• Length: 24 mm
• Weight: 0.11 kg (110 g)
• Colour: Black
• MPN: 2971C005
• EAN: 4549292115703

How to use

Align the red/white index marks on the EF lens and the adapter, attach the lens to the adapter and rotate until it locks. Then mount the adapter with the attached lens onto the EOS R camera body and rotate until it clicks in place. Turn on the camera and verify lens communication in the camera’s menu; the camera will control autofocus, aperture and stabilisation according to lens capabilities.

Recommendations

Use the adapter when you need to access existing EF lenses on RF-mount bodies, and check lens firmware and camera firmware for optimal compatibility. Avoid exposing contacts to dirt; store the adapter with caps when not in use and inspect seals periodically if shooting in harsh conditions.