Lens adapter compatibility

Pentax K lenses on L-Mount cameras

Can you use Pentax K lenses on L-Mount cameras? Yes, with a simple mechanical adapter (manual focus). The Pentax K flange distance is 45.46 mm and L-Mount is 20.00 mm, a difference of +25.46 mm.

+25.46 mm

Space for the adapter

45.46 mm

Pentax K flange

20.00 mm

L-Mount flange

Verdict: Yes — a simple 25.5 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.

Pentax K lenses you could adapt#

L-Mount cameras#

Other systems for Pentax K lenses#

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

Frequently asked questions#

Will Pentax K lenses autofocus on L-Mount?

No — adapted lenses are manual focus on this combination.

Does a Pentax K to L-Mount 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