Mount Adapter EF-EOS R
The plain adapter. About 110 g and 24 mm long, the difference between the two mounts' flange distances.
Check price on AmazonAdapters for Canon RF
Canon EF and EF-S lenses on RF cameras
Canon's own EF-EOS R adapters let every Canon EF and EF-S lens autofocus on an RF-mount camera, stabilisation included. Here is what each of the three adapters adds, and what changes on an APS-C body.
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Control Ring Mount Adapter EF-EOS R
Adds a clicking control ring you can set to aperture, shutter speed, ISO or exposure compensation, like the ring on RF lenses.
Check price on AmazonDrop-In Filter Mount Adapter EF-EOS R
Takes a drop-in variable ND or circular polariser inside the adapter, so one filter works on every adapted lens, including ultra-wides with no front thread.
Check price on AmazonWhat carries across
- Autofocus, including the camera's subject detection, with Canon EF and EF-S lenses.
- Image stabilisation in IS lenses; on the EOS R7 it works together with the camera's own stabilisation.
- Aperture control and the lens data in each file.
- The lens's own switches, and the camera's corrections for Canon lenses it knows.
On an APS-C body
On the R50, R10, R7, R100 and R50 V, an EF-S lens frames exactly as on a Canon APS-C DSLR: its focal length times 1.6. A full-frame EF lens frames the same way, 1.6 times tighter than its focal length: an EF 50 mm f/1.8 frames like 80 mm. Nothing is cropped beyond the sensor's own size.
What does not fit
EF-M lenses, from Canon's earlier M-series mirrorless cameras, do not fit RF cameras with any Canon adapter: their mount sits too close to the sensor. Lenses from Sigma, Tamron and others in the EF mount usually work through the adapter, but their makers decide which: check the lens maker's site.
What it adds
The plain adapter adds about 110 g and 24 mm to every adapted lens. For a lens you use daily, an RF or RF-S lens of the same kind is often lighter in total; each camera's page lists them with weights.
Cameras this applies to
Canon EOS R100, Canon EOS R50, Canon EOS R50 V, Canon EOS R10, Canon EOS R7.
Every Canon RF lens that fits without an adapter · Canon RF compatibility chart
Facts checked 9 Oct 2026 against the makers' specification pages. How we check
Questions
Do EF lenses autofocus on the Canon R50?
Yes, through any of Canon's EF-EOS R adapters, with the camera's subject detection.
Do I need the expensive adapter?
No. The plain Mount Adapter EF-EOS R keeps autofocus and stabilisation. The control-ring and drop-in filter versions add a ring or an internal filter.
Can I use EF-M lenses on an RF camera?
No. Canon makes no adapter from EF-M to RF.