Lens adapter compatibility

Pentax K lenses on Micro Four Thirds cameras

Can you use Pentax K lenses on Micro Four Thirds cameras? Yes, with a simple mechanical adapter (manual focus). The Pentax K flange distance is 45.46 mm and Micro Four Thirds is 19.25 mm, a difference of +26.21 mm.

+26.21 mm

Space for the adapter

45.46 mm

Pentax K flange

19.25 mm

Micro Four Thirds flange

Verdict: Yes — a simple 26.2 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.

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

Pentax K lenses you could adapt#

Micro Four Thirds cameras#

Other systems for Pentax K 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 Pentax K lenses autofocus on Micro Four Thirds?

No — adapted lenses are manual focus on this combination.

Does a Pentax K 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