Summary: Although I have only used the lens once for a walkabout in town to test it, it appears to be a quality lens as already commented on...just a bit of information if anyone plans to use a protective filter...which I prefer to do...due to the fixed lens hood the first filter I tried did not work...I now have a Hoya NXT HMC UV filter mounted...which does not impede the lens hood and is threaded on the outside so the supplied lens cover will screw onto it...
Summary: I considered this and the 14mm Pentax, and went with the 15mm based on reviews of lower distortion, and also due to its compact size. I also considered a wide angle zoom, but they were pricey and suffered to various degrees on poor resistance to flare and had more issues with CA and distortion. I am very happy with the choice. I have used it primarily for landscape photography, and occasional tight shots for the forced perspective.
Pentax smc DA 15mm f/4 ED AL Limited Ultra Wide Angle Lens
8 August 2012
Summary: The Pentax DA SMC 15mm Limited f/4.0 lens is in one word INCREDIBLE. This lens is fantastic in just about every way imaginable. If you shoot Pentax and are looking for an ultra wide angle lens...this is your lens! You won't be disappointed! Just do an internet search for lens reviews on this lens and see for yourself!
Summary: I've been a Pentax fan since I was a kid (70s). A great feature of Pentax is the lens mount size, on the cameras, has never changed. Any Pentax lens will pop right onto any Pentax camera. The benefit is older manual Pentax lens experience a doubling of the mm when used on a digital body. I had the traditional 18mm - 55mm, and a larger 55mm - 200mm. Yet, never a wide angle.
Summary: Received this lens on tuesday. At first use, if you are not a wide angle user, you might not appreciate this lens as much as a regular 35mm lens. I have been shooting with my 35mm Ltd and 100mm WR and using this lens compare to the 35mm at first few days will probably make you wants to return it. Then it happened. I was out walking my dog with my 35mm mounted on my K-7. Came across this row of trees and with my 35mm I will probably have to do a few shots and do a pano.
Summary: There are lots of wide angle lenses to choose from market out there. But only Pentax can make an ultra wide angle in such a small, compact and well-made lens like DA 15. Great lens for traveling, because you can simply put the limited lens in your pocket! Image quality is good at this price level as well!
Summary: Stop down 2 f-stops from wide open and the images are razor sharp across the entire image! And compared to the kit lens that came with my Pentax SLR this lens is in another leigh. Colors are crisper and more vibrant and sharpness and detail is outstanding. Amazingly, for a wide angle, there is virtually no barrel distortion!