Lens adapter compatibility

Tamron Adaptall lenses on Pentax Q cameras

Can you use Tamron Adaptall lenses on Pentax Q cameras? Yes, with a simple mechanical adapter (manual focus). The Tamron Adaptall flange distance is 50.70 mm and Pentax Q is 9.20 mm, a difference of +41.50 mm.

+41.50 mm

Space for the adapter

50.70 mm

Tamron Adaptall flange

9.20 mm

Pentax Q flange

Verdict: Yes — a simple 41.5 mm adapter keeps infinity focus.

What to expect#

Aperture control: these are mechanical lenses with aperture rings — set the aperture on the lens and shoot in aperture-priority or manual.

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 Tamron Adaptall lens frames like 275 mm. A focal reducer (“speed booster”) can bring back some width and gain about a stop of light.

Tamron Adaptall lenses you could adapt#

Tamron 200mm f/3.5 CT-200 BBAR

Pentax Q cameras#

Other systems for Tamron Adaptall lenses#

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

Frequently asked questions#

Will Tamron Adaptall lenses autofocus on Pentax Q?

No — adapted lenses are manual focus on this combination.

Does a Tamron Adaptall 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