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Canon Mount Adapter EF-EOS R

BH #CAMAEFRF • MFR #2971C002
1,001 reviews
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Canon Mount Adapter EF-EOS R
Key Features
  • Canon EF/EF-S Lens to EOS R Camera
  • Maintains AF and Image Stabilization
  • Dust- and Water-Resistant
Extending the range of compatible lenses, the Canon Mount Adapter EF-EOS R is a lightweight, compact lens adapter designed for attaching any EF or EF-S-mount lens to the EOS R mirrorless digital camera. This simple adapter retains full autofocus and image stabilization capabilities and contains no optical components, thereby maintaining the original optical quality of the mounted lens. It is also dust- and water-resistant, making it suitable for use in harsh weather conditions.
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Canon 2971C002 Overview

Extending the range of compatible lenses, the Canon Mount Adapter EF-EOS R is a lightweight, compact lens adapter designed for attaching any EF or EF-S-mount lens to the EOS R mirrorless digital camera. This simple adapter retains full autofocus and image stabilization capabilities and contains no optical components, thereby maintaining the original optical quality of the mounted lens. It is also dust- and water-resistant, making it suitable for use in harsh weather conditions.

UPC: 013803304886

Canon 2971C002 Specs

Item Type
1x Lens Mount Adapter
Camera Compatibility
Canon RF Mount
Lens Compatibility
Canon EF/EF-S Mount
Electronic Communication
Yes
Included Shims
Materials
Metal
Dimensions
Diameter: 2.8" / 71.1 mm
Depth: 0.9" / 22.9 mm
Weight
3.9 oz / 110 g
Packaging Info
Package Weight
0.6 lb
Box Dimensions (LxWxH)
5.4 x 4.7 x 3.3"

Canon 2971C002 Reviews

Works like a charm

By Faye
Rated 5 out of 5
Date: 2026-11-05

Works perfectly with my older canon 50 1.2 and 85 1.4 lenses on my new r6 mark 2. highly recommend if you aren't able to afford upgrading all your lenses at once.

Use your EF Glass with Confidence

By Kirk
Rated 4 out of 5
Date: 2026-10-05

Love getting a new R6 Mark III but wanted to keep all my EF glass. This adapter has saved me thousands and the EF glass is supported with only a few exceptions.

See any errors on this page?

What is the difference between this mount ...

What is the difference between this mount converter and the Control Ring Mount Adapter?
Asked by: Katie
One has the control ring which is useful but not necessary, and one is without.
Answered by: Kenneth
Date published: 2021-10-10

can this adapter be left on a mirrorless camera ...

can this adapter be left on a mirrorless camera "permanently" (with a body cap)?
Asked by: Amihai
The Canon Mount Adapter EF-EOS R can be left on the camera without issue. Do use a body cap.
Answered by: Dennis L
Date published: 2026-01-16

will this adapter allow an EF-m lens to work on ...

will this adapter allow an EF-m lens to work on an on the R10? Canon says The camera cannot be used with EF-M lenses.
Asked by: Linda
No, the Canon Mount Adapter EF-EOS R is used to adapt EF-lenses to Canon RF cameras. Unfortunately, there is no way to mount EF-M lenses on Canon RF cameras.
Answered by: James P
Date published: 2024-12-01

Is there any rotational play/wiggle/slack with EF ...

Is there any rotational play/wiggle/slack with EF lenses with this adapter, or is the adapter tight and doesn't have any play?
Asked by: Thatcher
ABSOLUTLEY NOT! On multiple lenses from 16-35mm ef to my 400mm f2.8. I bought 2 since I have a lot of L series Ef lenses! Image quality up to 24-36 enlargement does not seem affected.
Answered by: Gerold
Date published: 2022-04-23

I have a EF mount. Can this be used on that to ...

I have a EF mount. Can this be used on that to use my efs lenses?
Asked by: Matt
Yes. EFS lenses mount just fine and work great on the EOS R.
Answered by: Dale
Date published: 2020-08-07

I have an R100 and a lot of EF glass. Will this ...

I have an R100 and a lot of EF glass. Will this work? I just tried a third party adaptor and it didn’t work
Asked by: gerald
The Canon Mount Adapter EF-EOS R will work much better than a third-party adapter on a Canon R100 Mirrorless Camera, yes.
Answered by: Ejona G
Date published: 2025-04-21

Will a Canon E mount lens work with this?

Will a Canon E mount lens work with this?
Asked by: KEITH
This adapter is meant to be used with Canon "EF" and "EF-S" mount lenses, including third party lenses (Sigma, Tamron etc.). FYI - "E" mount is associated with Sony's mirrorless l cameras.
Answered by: Ranjit
Date published: 2022-09-11

Will this Adapter be compatible with the R5 R6 & ...

Will this Adapter be compatible with the R5 R6 & EF L lenses?
Asked by: Anonymous
Yes, I use it on an EOS and it works great. Canon also makes additional adapters for EF lease on the EOS R cameras, one that adds a control dial and one that allows for drop-in filters.
Answered by: Kevin
Date published: 2020-08-21
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