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 5.5× crop Pentax Q body a 50 mm Sigma SA lens frames like 275 mm. A focal reducer (“speed booster”) can bring back some width and gain about a stop of light.
Sigma SA lenses you could adapt#
- Sigma 100-400mm F5-6.3 DG OS HSM | C
- Sigma 100-400mm f/5-6.3 DG OS HSM | C +1.4x ext.
- Sigma 105 mm F1.4 DG HSM Art
- Sigma 14mm f/1.8 DG HSM | A
- Sigma 24mm f/1.4 DG HSM | A
- Sigma 28mm F1.4 DG HSM | Art
- Sigma 40mm F1.4 DG HSM | Art
- Sigma 70-200mm F2.8 DG OS HSM | S
- Sigma 10-20mm f/3.5 EX DC HSM
- Sigma 10-20mm f/4-5.6 EX DC
- Sigma 100-300mm f/4 APO EX DG HSM
- Sigma 100-300mm f/4 APO EX DG HSM + Kenko Teleplus PRO 300 AF 1.4× DGX ext.
- Sigma 105mm f/2.8 EX DG OS HSM Macro
- Sigma 10mm f/2.8 EX DC Fisheye HSM
- Sigma 12-24mm F4 DG HSM | A
- Sigma 12-24mm F4.5-5.6 II DG HSM
- Sigma 12-24mm f/4.5-5.6 EX DG Aspherical HSM
- Sigma 14mm f/2.8 EX
Pentax Q cameras#
- Pentax Q10 2013
- Pentax Q7 2013
- Pentax Q 2011
- Pentax Q-S1
Other systems for Sigma SA lenses#
Frequently asked questions#
Will Sigma SA lenses autofocus on Pentax Q?
No — adapted lenses are manual focus on this combination.
Does a Sigma SA to Pentax Q 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