New Member Registered: April, 2023 Posts: 1 | | Review Date: April 17, 2023 | Recommended | Price: $30.00
| Rating: 9 |
| Pros: | Tiny | | Cons: | No aperture | | Sharpness: 8
Aberrations: 7
Bokeh: 7
Handling: 7
Value: 10
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A great lens to use on an APSC camera.
The main advantage is size and weight as it makes small cameras very pocketable.
It's my most used lens on a Sony A5100.
Center sharpness is very good. 
The corners and edges are very blurry but this can help to add emphasis to the center.
The vignette is not very strong and is over powered by the blur.
It's the least susceptible to flare of all of the Pentax Auto lenses.
As a walk around lens the F2.8 aperture means you have to check the focus as the depth of field is not super wide but focus peaking makes it quick work.
If you want an analogue look and can appreciate the blur this lens is better than the sum of its parts.
For M4/3 cameras I prefer the 18mm.
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Pentaxian Registered: December, 2016 Location: London Posts: 1,079 | | Review Date: May 15, 2021 | Not Recommended
| Rating: 4 |
| Pros: | Tiny | | Cons: | Very soft, poor depth of field, no iris | | Sharpness: 4
Aberrations: 5
Bokeh: 5
Handling: 7
Value: 5
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I've tested a few different Pentax 110 lenses on a Panasonic Lumix DMC-G1 with a Pixco adapter
The 24mm lens I tried was in good condition but I really wasn't happy with a lot of the results - it was difficult to get a sharp image at all. I may have been unlucky with it in some way, but I couldn't see any obvious faults. It really felt like it just wasn't a particularly good lens. Some examples (hopefully the best with this lens):
the album is here
https://www.flickr.com/photos/150868539@N02/albums/72157718461017862
Any file with the name beginning Pen110-24mm is with this lens.
Update - I've since tried other examples of this lens and seemed to get better results, I think I was just unlucky with this one - it was the first Pentax 110 lens I tried and I may not have been using it at its best.
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Senior Member Registered: August, 2012 Posts: 118
1 user found this helpful
| | Review Date: July 29, 2015 | Recommended | Price: $15.00
| Rating: 10 |
| Pros: | Size, Price, IQ | | Cons: | Fixed aperture, flare without lens hood. | | Sharpness: 10
Aberrations: 9
Bokeh: 10
Handling: 7
Value: 10
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Used on a Q-S1 with rubber washer in 110 adapter giving it an f4.5 aperture.
Small amount of fringing.
Benefits greatly from a lens hood—a least 1" deep.
Nice angle of view (35mm ff equivalent of 110mm) when used on a Q7.
1"x1.33" FOV with S16 close-up lens.
UPDATE: Did some more tests and shimmed the Q adapter to achieve proper infinity focus. It's sharper than the 02 zoom edge to edge.
It gets low marks on handling due to its extremely small size making it tricky to focus and its lack of adjustable stops.
Definitely much better than the 05 Toy telephoto at half the price (including adapter!)
I've got two copies, one was very good, the other even better!
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Loyal Site Supporter Registered: August, 2012 Location: Wanganui Posts: 5,762
3 users found this helpful
| | Review Date: March 14, 2014 | Recommended
| Rating: 9 |
| Pros: | Sharpness Contrast | | Cons: | Not so sharp wide open at 2.8 | | Sharpness: 9
Aberrations: 9
Bokeh: 7
Handling: 8
Value: 10
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I have stopped this lens down to about f4.5 by sticking a ringbinder reinforcing ring onto the back element surround. First of all I felttipped the ring black. This made a great difference to the sharpness and contrast seemed to increase. As the examples show I feel this lens handles hi contrast images without flaring out. I am using this lens on a Q and it is very easy to operate. It is funny but some lens feel more creative than others when out shooting. This lens in conjunction with the Q is extremely creative.     | |
Veteran Member Registered: November, 2009 Location: Strand Posts: 1,366
1 user found this helpful
| | Review Date: June 12, 2013 | Recommended
| Rating: 9 |
| Pros: | small, light weight, very sharp center | | Cons: | vignette a bit, less sharp at far edges, no aperture control | | Sharpness: 9
Aberrations: 9
Bokeh: 9
Handling: 10
Value: 10
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this is my smallest 24mm ever. center sharpness is excellent. very portable. not so good for landscape, but very good for close portraits.
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Veteran Member Registered: February, 2009 Location: Edmonton Posts: 314
5 users found this helpful
| | Review Date: November 2, 2011 | Not Recommended | Price: $35.00
| Rating: 6 |
| Pros: | Good on 110 film, small size | | Cons: | Poor resolution and purple fringing on digital | | Sharpness: 4
Aberrations: 3
Bokeh: 7
Handling: 10
Value: 6
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The Pentax-110 24mm f/2.8 lens is okay on its intended format of 110 film with decent contrast and acceptable resolution. Flare is a big problem with this lens, resulting not only in a giant flare spot, but a significant amount of veiling flare as well. On 110 format I give it a 8/10, it is an extremely compact "normal" lens for the Auto 110 system, and performs very well unless you shoot into the sun. 
The first shot is an example of the flare issue, the second is a more well-rounded shot which shows the positive characteristics of the lens.
 
However, the main reason I purchased this lens was so I could use it with the Pentax Q. The resolution of the Q does a good job of exposing the weak points of this lens. It is very soft, only a significant amount of sharpening during post can yield a sharp usable image. In addition to lack of sharpness you must contend with a significant amount of purple fringing. Finally, the flare problems the lens encounters on 110 format are much worse using the cropped sensor of the Q, the veiling flare robs so much contrast that many images shot towards a light source become unusable. I score the lens 4/10 for the Q system.
The first image of my cat is one of the best results I have managed from this lens on the Q, even with copious amounts of sharpening applied, you can still tell the image is soft when viewed large. The second is merely a test shot, only the centre of the image is sharp, things get dramatically worse towards the edges.
 
$35 included an Auto 110 camera and the 50mm f/2.8 lens (which is MUCH better).
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04/16/12 update: Using a lensbaby f/8 aperture disc (6mm diameter hole) placed in front of the lens stops it down approximately 1 stop when used on the Q. The lens sees an incredible increase in sharpness when used stopped down this way. Easily into usable territory, if you don't mind losing a stop of light.
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