Excerpt: I bought this for use with my Pentax K-5. The image quality is superior to telezooms I have owned previously. I have used it for children's football events, portraits and landscape fotography so far, and I am very pleased.
Pros: Fast / accurate auto-focus, Nice Bokeh, Rugged, Strong Construction
Excerpt: I use this lens mostly for wildlife and landscape work. Extremely well built, weather sealed, fast, and sharp at all F-stops. My only gripe with this lens is its weight. It is heavy. But, considering the build quality and superb optics, the extra weight is not a very big issue.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Nice Bokeh, Rugged, Strong Construction
Excerpt: I have found this to be a very usable lens and I can get a lot closer to things than I would have thought possible. It's a little bit heavy but take it for a photo walk and it's a lot better than a gym workout.
Excerpt: This is an ultra clear lens I use on my K10D for landscapes, wildlife and, most recently, weddings. With a fast aperture, I was able to shoot a wedding ceremony from the back of a (smallish) church using my AF540 flash. I have several 20 X 24 landscape prints that resemble paintings.