Lens adapter compatibility

Leica M lenses on Pentax K cameras

Can you use Leica M lenses on Pentax K cameras? Not with a simple adapter — infinity focus is lost. The Leica M flange distance is 27.80 mm and Pentax K is 45.46 mm, a difference of -17.66 mm.

-17.66 mm

Space for the adapter

27.80 mm

Leica M flange

45.46 mm

Pentax K flange

Verdict: No infinity focus — the Leica M flange is 17.7 mm shorter than the body's, so an adapter would need corrective glass.

What to expect#

Adapters with an optical element exist for some combinations, but they reduce image quality. A glass-free adapter in this direction only works for macro/close focus.

Leica M lenses you could adapt#

Pentax K cameras#

Other systems for Leica M lenses#

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

Frequently asked questions#

Will Leica M lenses autofocus on Pentax K?

This adapter direction is not practical.

Does a Leica M to Pentax K adapter affect image quality?

Any adapter that restores infinity focus here needs a corrective lens, which typically lowers sharpness and adds a slight teleconverter effect.

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