Excerpt: The lens is small, has a very useful focal length for street photography and landscapes. Color rendering is great , and corners are not very sharp but get sharper when the lens is stopped down to f8.
Pros: Small, rendering, focal length on APS-C
Cons: Not so fast, not very sharp on the borders but acceptable
Excerpt: This is one of the must have DA fixed focal length lenses. The design is quite nice with metal lens shade and all metal housing. It feels great. Optically it is quite OK for price and size. A maximum opening of 3.2 is slow but owed to the small dimensions.
Excerpt: This is a long awaited lens for me, not having decided to buy it until I had to travel overseas. I already have the DA 12-24, which serves my wide angle purposes perfectly, and I found hard to beat.
Pros: Compact size and weight, excellent IQ, fast focusing
Cons: f/3.2 max aperture, which if larger would mean a larger lens
Excerpt: It is not the perfect lens, mainly because it is quite soft on borders, even stopped down. My understanding is that this is not softness but field curvature. The result is the same: border tend to lack sharpness even stopped down... At least when you put focus to infinite.
Pros: great colors, small, light, perfect walkaround lens
Summary: This compact gem is perhaps the perfect little walk-around lens for your Pentax. Unobtrusive, it gives your camera a unique perspective that doesn't scream wide angle but is wider and can be more useful than (35mm equiv.) 35 and 50mm focal lengths.