Excerpt: This is just the lens I needed for shooting pictures in museums, where the lighting is universally horrible, and where exhibits are so close together you have to be very close to the subject. At f2.8, coupled with the higher ASA possibilities of the Pentax cameras, lighting is no longer a problem.
Pros: 90 Degree Fov, Fast F28, Perfect Pentax Optics
Summary: Photographers who have been around for a while and know a bit of history, know that Pentax has often delivered good quality equipment. Pentax users are a resilient bunch ever unbending to the likes of Canon and Nikon. And yes, they do have a reason for that.
Summary: I am a Canon shooter (I shoot a 5DM3) and this 15mm Limited prime is the main reason why I am still hanging on to my Pentax cameras. Great piece of glass. When paired with my Pentax K5, it is my ultimate landscape setup. Unbelievably sharp at F8.
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..
Summary: This is the most underrated Pentax lens, but it is a real gem. Pros: -Close focusing (less than the specified 17cm). -Large aperture. Shallower DoF if you need it. Best results @f/5.6. -Filter thread. -Autofocus with full time manual override. -IF (Internal focusing).
Summary: Highly recommended lens. I wanted a fast, wide angle lens to complement the rest of my collection, and this one fits the bill. I take a lot of pictures for official ceremonies indoors, so this matches up well with my portrait lens.
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.