Lens adapter compatibility

Four Thirds lenses on Canon RF cameras

Can you use Four Thirds lenses on Canon RF cameras? Yes, with a simple mechanical adapter (manual focus). The Four Thirds flange distance is 38.67 mm and Canon RF is 20.00 mm, a difference of +18.67 mm.

+18.67 mm

Space for the adapter

38.67 mm

Four Thirds flange

20.00 mm

Canon RF flange

Verdict: Yes — a simple 18.7 mm adapter keeps infinity focus.

What to expect#

Aperture control: lenses with a manual aperture ring work directly; electronically controlled lenses (no ring) need a smart adapter or one with a built-in aperture lever.

Focus: use focus peaking and magnification in the viewfinder. Exposure metering works normally because the camera meters through the lens at working aperture.

Image circle: Four Thirds lenses are designed for a smaller sensor (≈2.0× crop), so expect heavy vignetting on a full-frame Canon RF body unless you use its crop mode.

Four Thirds lenses you could adapt#

Canon RF cameras#

Other systems for Four Thirds lenses#

Sony E-mount Nikon Z Fujifilm X-mount Micro Four Thirds L-Mount Canon EF-M Fujifilm G-mount Hasselblad XCD Nikon 1 (CX)Pentax Q

Frequently asked questions#

Will Four Thirds lenses autofocus on Canon RF?

No — adapted lenses are manual focus on this combination.

Does a Four Thirds to Canon RF adapter affect image quality?

A glass-free adapter is just a precisely machined spacer, so image quality is unchanged when it is built to the right thickness. Cheap adapters can be slightly too thin or thick, which shifts the infinity mark.

Last updated October 03, 2026 · How we calculate · Sources