Excerpt: Excelent build, great focus speed and accuracy. Some PF and CA natural in such wides, but fully controllable if shooting RAW or using lens correction utilities with in camera RAW development in K-3 body. Excellent flare control. If a CPL is needed, get a good quality one with thin brass ring, as it may vignette at 12 mm. Only negative thing is size compared to focal length, as it is bigger and longer than all the kit zooms in the 16/18 to 70/85/135 range.
Pros: Consistent Output, Fast / accurate auto-focus, Nice Bokeh, Rugged
Summary: I'm Mary's husband, and the lens was purchased for me. Some of the reviews this lens has received mention a lot of color fringing at edges of high contrasts in the scene. This individual lens exhibits very little of this optical fault. At 12mm on an P:entax K5, the 90 degree wide angle is very good, and 24mm it's a moderate wide angle and excellent. It will be very useful for building interiors and wide overall scenic views.
Summary: I don't know why there isn't more love for this lens. For shooting landscapes you can't beat it - typical Pentax IQ rendering and super sharp. I am not much of a prime lens person, so this works out perfectly for landscapes for me. I read many reviews, and this lens is supposed to rival or even beat the great DA 15 Limited. Yes the lens is pretty big, but I am used to larger lenses since I shoot mostly with my DA* 60-250 and DA* 300 on my gripped K-5IIs.
Summary: Works perfectly. In my case though I find it too big and I use the 15mm from Pentax instead although this one is more versatile. Guess it's a matter of preference, so if you can live with the size I'd say this is not only more versatile than the 15mm, the pictures are also sharper on this beast.
Excellent adventure - some "width" distortion center vs edge
Deux Bits "These go to Eleven", Amazon
21 April 2013
Summary: First - I love it. Makes my trips to wonderful landscapes even more fun. Produces beautiful shots, controls flare extremely well. Works well on a K5. As other reviewers have noted - it's big, the lens hood's size makes it more unwieldy and the hood does throw a shadow with the on camera flash. Now a little bit about the width distortion. I was torn between this lens and the less expensive and smaller, Pentax 10-17FishEye.
Excerpt: Of all my lenses this is my favorite. It is just great for taking intimate shots of small groups of people at diner parties and other indoor gathereings. It is sharp and even in lowish lighting I can normally get an acceptable shot without resorting to flash (ISO has to be up a bit). The range is just perfect for this type of work and I am happy with the results of the lens. Any faults in the photos are lack of skill rather than this excellent lens.
Pros: Consistent Output, Durable, Fast / accurate auto-focus, Strong Construction
Summary: I am still learning how to use it, but this is a wonderful wide angle lens and takes fantastic pics of landscapes and structures. I shopped around quite a bit and did lots of research. I always kept coming back to the DA 12-24 for my Pentax K-x digital. The only thing that kept holding me back was the price..... much more than anything else. I have a wonderful zoom lens made for Pentax and like the feel and weight of it.