It is my most most expensive lens for Pentax K 30 and I had long hesitated because I thought the focal length range is still very special and who knows how many times I would actually use it ... Well, now I have a good piece for about 9 months and it would never, never give it back! Since I photograph a lot in the city, it is suitable even as "always-on" lens. One can therefore go so close that annoying street signs just behind stay behind and you can achieve amazing effects. You zoom up to 18 or 20 mm, but also arise completely "normal", non-warped images.
Small note: About the sharpness and image quality I can not say as much, since I'm not the type to look at every single pixel. To me it seems more like the effect and to the possibility of my ideas into practice.
