Lens adapter compatibility

Pentax K lenses on Nikon F cameras

Can you use Pentax K lenses on Nikon F cameras? Not with a simple adapter — infinity focus is lost. The Pentax K flange distance is 45.46 mm and Nikon F is 46.50 mm, a difference of -1.04 mm.

-1.04 mm
Space for the adapter
45.46 mm
Pentax K flange
46.50 mm
Nikon F flange
Verdict: No infinity focus — the Pentax K flange is 1.0 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.

Pentax K lenses you could adapt#

Nikon F cameras#

Other systems for Pentax K lenses#

Sony E-mountCanon RFNikon ZFujifilm X-mountMicro Four ThirdsL-MountCanon EF-MFujifilm G-mountHasselblad XCDNikon 1 (CX)

Frequently asked questions#

Will Pentax K lenses autofocus on Nikon F?

This adapter direction is not practical.

Does a Pentax K to Nikon F 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

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