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Pentax Adapter Q for K-Mount Lens Review RSS Feed

Pentax Adapter Q for K-Mount Lens

Reviews Views Date of last review
2 31,876 Thu February 14, 2013
Recommended By Average Price Average User Rating
100% of reviewers $250.50 9.50
Pentax Adapter Q for K-Mount Lens

Pentax Adapter Q for K-Mount Lens
Pentax Adapter Q for K-Mount Lens
Pentax Adapter Q for K-Mount Lens
Pentax Adapter Q for K-Mount Lens


This Pentax Q-mount adapter allows you to use regular K-mount lenses on the Pentax Q line of cameras (the original Pentax Q requires a firmware update to use the adapter).  The adapter includes an aperture ring which allows you to control the aperture even on lenses without an aperture ring. There is no provision for autofocus even if the attached lens is an autofocus lens.

In other words, this adapter converts Pentax K-mount lenses into manual focus Q-mount lenses. The "crop factor" is 5.6 on the Q/Q10 and 4.6 on the Q7/QS-1, so a 300 mm K-mount lens will for instance yield a field of view corresponding to a 1650 or 1380 mm super tele on 35mm film.

The adapter has a built-in mechanical leaf shutter with speeds from 1/1000 s to 30 s. Using this shutter rather than the camera's electronic shutter prevents the rolling shutter effect on fast moving objects.

An optional tripod bracket is available.  The bracket is the same as the one used on the Pentax DA* 300mm F4 lens.

The K to Q adapter works with all Pentax Q-mount bodies.

Pentax Adapter Q for K-mount Lens
©, sharable with attribution
Image Format
Q (1/1.7")
Lens Mount
Pentax Q
Light Loss
0 stops
0 elements, 0 groups
Mount Variant (Rear)
Mount Variant (Front)
Weather Sealing
Other Features
Leaf Shutter
Diam x Length
68 x 37 mm
145 g
Production Years
(in production)
Launch Price
249 USD
User reviews
In-depth review
This adapter allows for mounting K mount lenses on a Q-mount camera.
The only exposure modes supported are M and Av with stop down metering, and Bulb.
The adapter has an aperture ring for control of the diaphragm of lenses without aperture ring.
The adapter has no provision for the camera stopping the aperture down.
The adapter has a built-in five blade leaf shutter with shutter speeds from 1/1000 s to 30 s.
Purchase: Buy the Pentax Adapter Q for K-Mount Lens
In-Depth Review: Read our Pentax Adapter Q for K-Mount Lens in-depth review!
Price: $249
Price History:

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Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 1-2 of 2
Veteran Member

Registered: March, 2009
Location: Lithuania
Posts: 1,203
Review Date: February 14, 2013 Recommended | Price: $252.00 | Rating: 9 

Pros: Build quality, works with every K mount lens, crazy macro shots, transforms your Q camera in to digital telescope.
Cons: Tripod foot not included, price

This adepter is perfect, build quality is like Pentax limited lens series.
I had to wait three mouth for it, but it is worth a wait. I can take crazy tele and macro shots, with my Q10. Only to buts, it's price, could be at least 50$ cheeper, and tripod foot not included witch is must have for super tele shots.
Some quick test shots with 35mm limited macro lens

Pentax Q to K adapter test
Site Supporter

Registered: July, 2010
Location: Los Angeles, CA
Posts: 9,807

4 users found this helpful
Review Date: December 20, 2012 Recommended | Price: $249.00 | Rating: 10 

Pros: High quality, Leaf shutter, Precision aperture
Cons: Tripod foot not included

When I first received the adapter I was quite impressed by its build quality and engineering.
The feel of the adapter is similar to a Pentax lens and it has some heft to it.
It is a good match for the Q's magnesium build.
The adapter has a built in leaf shutter that eliminates the jello effect of the electronic shutter in the camera, when you take a shot one can hear a solid "Snap!" from the shutter in its working range. The camera can be set to work past the 1/1000 limit of the adapter, using the camera's electronic shutter when the higher speeds are needed.

The adapter uses a non-detented aperture dial, and at first I was concerned that it could be easily moved out of position, but after weeks of use I find the action is very smooth and precise and there is no problem using it when on a tripod. If you are doing hand held work there may be times when the dial will be moved, so it is good to keep an eye on it.

The results from the Q using adapted lenses with any adapter can be very good and are strictly lens dependent, since neither this or any third party adapter adds any lenses to the light path.
Direct comparison of similar scenes between the Pentax adapter and a Fotodiox version yielded similar results.
The main advantage of this adapter is the built in leaf shutter that eliminates any distortion from the electronic shutter and also allows for faster flash speeds which may be beneficial for applications such as macro.

The adapter has an attachment point for a tripod mounting foot, the foot is sold separately and is priced just under $50.
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