Lens adapter compatibility

Four Thirds lenses on Micro Four Thirds cameras

Can you use Four Thirds lenses on Micro Four Thirds cameras? Yes — and autofocus can work with the right electronic adapter. The Four Thirds flange distance is 38.67 mm and Micro Four Thirds is 19.25 mm, a difference of +19.42 mm.

+19.42 mm

Space for the adapter

38.67 mm

Four Thirds flange

19.25 mm

Micro Four Thirds flange

Verdict: Yes — a simple 19.4 mm adapter keeps infinity focus.

What to expect#

Electronic adapters: Olympus MMF-1/2/3 is a hollow adapter with full electronic communication — Four Thirds lenses autofocus, best on phase-detect bodies.

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.

Crop factor: on a 2.0× crop Micro Four Thirds body a 50 mm Four Thirds lens frames like 100 mm. A focal reducer (“speed booster”) can bring back some width and gain about a stop of light.

Four Thirds lenses you could adapt#

Micro Four Thirds cameras#

Other systems for Four Thirds lenses#

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

Frequently asked questions#

Will Four Thirds lenses autofocus on Micro Four Thirds?

Olympus MMF-1/2/3 is a hollow adapter with full electronic communication — Four Thirds lenses autofocus, best on phase-detect bodies.

Does a Four Thirds to Micro Four Thirds 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