Summary: I love this lens, I bought it for my pentax K200D, works great with my camera. It's what one would refer to as a snubnose lens. I have purchased sigma lens before and they are good lenses, you will not be disappointed with this lens.
Summary: I couldn't be more pleased with this lens. The pictures taken with it and my Pentax K-10 camera are crisp, clean and always in focus. It's a great intermediate range lens, and at the price here at Amazon, a real value. I paid 60 dollars less than my local camera store or the Sigma web site. For great quality and value, this is as good as it gets.
Summary: This lens is very sharp from one end to the other, having taken baby portraits to flying birds and aircraft, it produces great color and it focuses quickly. I was so happy with the Sigma quality that now I have two other Sigma lenses!
Excellent Lens - slightly warm tones - fixable though
Dilip Trivedi "Dilip", Amazon
6 October 2008
Summary: This is a very nice lens - I read several reviews and decided to go for it. The colors are a bit on the warmer side (more red than reality) - but you can fix it either on the camera (by lowering saturation) or on ACDSee (reduce red color). Perhaps a bit on the soft side, but I am learning that DSLR images are great and lend themselves to sharpening with any software without much noise or artifacts.
Summary: I bought this lens hoping it would give me the over all photo lens capability for general photography I want. This lens for the money has come close to that expectation. It is a very good lens. I have shot over 2100 photographs of people and scenes, great clarity for the price. I have no complaints so far.
Summary: I have compared this lens with Nikon's version of the 55-200mm, and I find the auto focus of the Sigma lens to be faster and snappier than that of the Nikon lens. Also, in terms of sharpness of image, I can't tell the difference - seems to produce every bit as sharp and clear an image as the Nikon lens does - at a significantly lower cost! A good solid value for the going price.