+18.76 mm
Space for the adapter
45.46 mm
Pentax K flange
26.70 mm
Fujifilm G-mount flange
Verdict: Yes — a simple 18.8 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#
- Laowa 12mm f/2.8 Zero-D
- Laowa 15mm F/4 Wide Angle Macro
- Laowa 60mm f/2.8 2X Ultra-Macro
- Samyang 10mm f/2.8 ED AS NCS CS
- Samyang 135mm f/2 ED UMC
- Samyang 14mm f/2.8 AE ED AS IF UMC
- Samyang 16mm f/2.0 ED AS UMC CS
- Samyang 20mm f/1.8 ED AS UMC
- Samyang 24mm f/1.4 ED AS IF UMC
- Samyang 85mm f/1.4 IF UMC Aspherical
- Samyang 8mm f/3.5 Fish-Eye CS
- Samyang T-S 24mm f/3.5 ED AS UMC
- Pentax F 28-80mm f/3.5-4.5
- Pentax HD Pentax DA* 16-50mm f/2.8 ED PLM AW
- Pentax HD Pentax-D FA 15-30mm f/2.8 ED SDM WR
- Pentax HD Pentax-D FA 150-450mm f/4.5-5.6 ED DC AW
- Pentax HD Pentax-D FA 24-70mm f/2.8 ED SDM WR
- Pentax HD Pentax-D FA 28-105mm f/3.5-5.6 ED DC WR
Fujifilm G-mount cameras#
- Fujifilm GFX100S II 2024
- Fujifilm GFX100 II 2023
- Fujifilm GFX100S 2021
- Fujifilm GFX50S II 2021
- Fujifilm GFX100 2019
- Fujifilm GFX 50R 2018
- Fujifilm GFX 50S 2017
- Kyocera Contax G
Other systems for Pentax K lenses#
Frequently asked questions#
Will Pentax K lenses autofocus on Fujifilm G-mount?
No — adapted lenses are manual focus on this combination.
Does a Pentax K to Fujifilm G-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