Commlite · Canon EF → Canon RF adapter
Commlite CM-EF-EOS R — Canon EF → Canon RF adapter
Third-party EF → Canon RF adapter at ~50% the price of Canon's first-party EF-EOS R. Preserves AF / IS / electronic aperture on every EF / EF-S Canon and Sigma DG / Tamron Di USM / STM lens; USB-C firmware updatable.
At a glance
- Vendor
- Commlite
- Release year
- 2019
- Body-side contacts
- 12 pins
- Flags
- firmware-updatableweather-sealed —requires 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
Functionally similar to Viltrox EF-EOS R5; Viltrox tracks slightly better on EF L super-telephotos in side-by-side tests, Commlite costs slightly less. Both lack the weather sealing of Canon's official adapter.
Firmware history
Firmware history
- v1.0
- Initial release — Canon EF / EF-S onto Canon RF (R / RP / R5 / R6) with AF / IS / electronic aperture
- v2.0
- R5 II / R6 II / R7 / R10 / R8 PDAF rule alignment
- EF-S APS-C crop-mode handling refinements
Approximate milestones — verify against the Commlite firmware page for the authoritative changelog.
Common questions
- Should I get the Commlite CM-EF-EOS R over Canon's first-party EF-EOS R?
- If budget matters and you don't need weather sealing, yes — the Commlite is ~50% cheaper with similar AF / IS / electronic aperture preservation on every EF / EF-S USM / STM lens. Canon's official adapter is weather-sealed and ships in three variants (plain, Control Ring, Drop-In Filter); the Commlite only ships a plain variant and isn't weather-sealed. For heavy professional use with weather-sealed RF body + EF L super-telephoto, the Canon is worth the premium. For everyday RF use, Commlite or Viltrox EF-EOS R5 saves ~$80-100.
- Does it preserve EF-S lens APS-C crop mode on RF bodies?
- Yes — v2.0 firmware refined EF-S crop-mode handling. Mounting an EF-S lens on a full-frame RF body (R5 / R6 / R3 / R5 II / R6 II / R8) auto-engages 1.6× APS-C crop mode just as the first-party adapter does. On crop RF bodies (R7 / R10 / R50 / R100) the body is already in APS-C natively, so no crop-mode switching is needed.
- Will it autofocus on the R5 II or R6 II?
- Yes — v2.0 firmware (2022) added R5 II / R6 II / R7 / R10 / R8 PDAF rule alignment. AF tracking is slightly slower than the same EF lens on Canon's first-party EF-EOS R, but Single-Servo and Continuous-Servo both work reliably on USM / STM EF lenses. EF L II / III primes (24 / 35 / 50 / 85 / 135) all preserve AF, IS, and electronic aperture.
Head-to-head comparisons
Mounts on either side
Other adapters worth comparing
More from Commlite
Same lens-side mount (Canon EF)
- Canon EF-EOS R — onto Canon RF · 2018
- 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
- 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)
- Canon EF-EOS R — from Canon EF · 2018
- 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
- Fotodiox FD-RF — from Canon FD · 2019
Keep exploring
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