Excerpt: One could say that the plastic finish is not good; This is very true. Compared to ltd, you don't benefit of an included hood (there no hood at all included in fact !). The plastic will suffer if you mix the lens with other more robust metal lens. It is also very important to have caps at any time to protect the lens as the lens body will not do anything on this topic.
Pros: great color rendition, very sharp wide open, very light, stuning flare resistance.
Excerpt: This lens is extremely cheap for the IQ it delivers. The lens itself is plastic rather than metal, to make it more economic but at the end of the day the glass is what matters and the glass truly shines. I feel like I stole this lens for what I paid for it.
Excerpt: After reading about this "Plastic Fantastic" I had to get one. It was One of my first purchases to add to my kit lenses and boy am I happy to have added this lens to my portofoio. Very sharp at center with slight softening as you go out to the edges -- across virtually all aperture settings. I would definitely call this a "Sharp" lens and it does make for some very crisp photos.
Pros: Reasonably priced. Comapct in size. Sharp. Excellent color reproduction.
Cons: Focus is a bit loud. Plastic with no metal mount typical of DA
Summary: Everyone should have a couple excellent prime lenses. For the price, I don't think you can get a better one for your Pentax. Its excellent image quality and useful (35mm equiv.) 52mm focal length make it a winner. It was no accident that 50-55mm lenses used to be the standard lenses included with film 35mm SLR's. Sharpness and versatility are their trade.
Summary: Great inexpensive "normal" angle lens on a Pentax APS-c camera. Sharp. Wonderful picture quality. A super bargain price for a nice prime lens. Light weight plastic body and mount can garner some criticism but you trade that (not quality) for the price. About a stop slower than a f/1.8 but with really usable high ISO photos from high end cameras now a days the stop will not be missed. Used with my Pentax K-5 and it rocks.