Canon · Canon EF → Canon RF adapter
Canon EF-EOS R — Canon EF → Canon RF adapter
Canon-first-party adapter for EF / EF-S → RF / RF-S bodies. Preserves AF, IS, electronic aperture on every EF lens since 1987.
At a glance
- Vendor
- Canon
- Release year
- 2018
- Body-side contacts
- 12 pins
- Flags
- firmware-updatable —weather-sealedrequires glass —
What this adapter preserves
Compatibility for Canon EF lens on a Canon RF body (computed from the lensmount dataset — open the Canon EF to Canon RF adapter page for the full verdict, flange clearance, and adapter caveats).
- Focus: Full AF
- IS: IS / IBIS preserved
- Aperture: Electronic aperture
- Infinity focus: Reaches infinity
What it does
Three variants: plain, Control Ring (extra rotation ring), Drop-In Filter (variable ND or circular polarizer slides in).
Common questions
- Does the EF-EOS R preserve autofocus on every EF lens?
- Yes — every USM, STM, and screw-drive EF / EF-S lens keeps its native AF behaviour on an RF body. The adapter forwards Canon's full EF lens protocol over its 12 body-side contacts unchanged.
- Which version should I get — plain, Control Ring, or Drop-In Filter?
- The plain version covers most photographers. Control Ring adds a programmable rotation ring matching native RF lens ergonomics. Drop-In Filter accepts a variable ND or circular polarizer slot — useful for video shooters dealing with mixed front-element sizes.
- Does it work with EF-S (APS-C) lenses on a full-frame RF body?
- Yes — the RF body auto-engages 1.6× APS-C crop mode whenever an EF-S lens is mounted, so the imaging area matches the lens's image circle without vignetting.
Head-to-head comparisons
Mounts on either side
Other adapters worth comparing
More from Canon
Same lens-side mount (Canon EF)
- Sigma MC-11 — onto Sony E · 2016
- Sigma MC-21 — onto L-Mount · 2019
- Metabones EF-E Mark V — onto Sony E · 2017
- Metabones Speed Booster ULTRA 0.71× EF-E — onto Sony E · 2014
- Viltrox EF-EOS R5 (autofocus EF-to-RF) — onto Canon RF · 2024
- Viltrox EF-NEX IV (EF-E) — onto Sony E · 2018
- Fringer EF-FX Pro II — onto Fujifilm X · 2020
- Fringer EF-GFX Pro — onto Fujifilm GFX · 2019
- Canon EF-EOS M — onto Canon EF-M · 2012
- Fotodiox Pro EF-NEX — onto Sony E · 2018
- Kipon Baveyes EF-FE 0.7x — onto Sony E · 2017
- Kipon Baveyes EF-FX 0.7x — onto Fujifilm X · 2017
- Commlite CM-EF-NEX HS — onto Sony E · 2018
- Commlite CM-EF-EOS R — onto Canon RF · 2019
- Viltrox EF-M2 II — onto Micro Four Thirds · 2018
- Fotodiox Vizelex ND Throttle EF-NEX — onto Sony E · 2014
- Fringer EF-NZ II — onto Nikon Z · 2023
Same body-side mount (Canon RF)
- Viltrox EF-EOS R5 (autofocus EF-to-RF) — from Canon EF · 2024
- K&F Concept M42-EOS R Pro — from M42 · 2020
- Novoflex EOSR/LEM — from Leica M · 2019
- Commlite CM-EF-EOS R — from Canon EF · 2019
- Fotodiox FD-RF — from Canon FD · 2019
Keep exploring
Back to every adapter we track, or jump to the full cross-brand compatibility matrix. Need a kit recommendation? Open the adapter picker.