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 Canon EF-S lens frames like 275 mm. A focal reducer (“speed booster”) can bring back some width and gain about a stop of light.
Canon EF-S lenses you could adapt#
- Canon EF 75-300mm F4-5.6 III
- Canon EF-S 18-135mm f/3.5-5.6 IS
- Canon EF-S 18-135mm f/3.5-5.6 IS STM
- Canon EF-S 55-250mm f/4-5.6 IS STM
- Canon EF-S 60mm f/2.8 Macro USM
- Canon EF-S 10-18mm f/4.5-5.6 IS STM
- Canon EF-S 10-22mm f/3.5-4.5 USM
- Canon EF-S 15-85mm f/3.5-5.6 IS USM
- Canon EF-S 17-55mm f/2.8 IS USM
- Canon EF-S 17-85mm f/4-5.6 IS USM
- Canon EF-S 18-135mm f/3.5-5.6 IS USM
- Canon EF-S 18-200mm f/3.5-5.6 IS
- Canon EF-S 18-55mm f/3.5-5.6
- Canon EF-S 18-55mm f/3.5-5.6 II
- Canon EF-S 18-55mm f/3.5-5.6 III
- Canon EF-S 18-55mm f/3.5-5.6 IS
- Canon EF-S 18-55mm f/3.5-5.6 IS II
- Canon EF-S 18-55mm f/3.5-5.6 IS STM
Pentax Q cameras#
- Pentax Q10 2013
- Pentax Q7 2013
- Pentax Q 2011
- Pentax Q-S1
Other systems for Canon EF-S lenses#
Frequently asked questions#
Will Canon EF-S lenses autofocus on Pentax Q?
No — adapted lenses are manual focus on this combination.
Does a Canon EF-S 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