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.
Summary: La qualité optique est excellente, dès f2,8 le piqué est bien là, seules quelques rares situations à f2,8 peuvent engendrer des franges pourpres dans des zones surexposées. Aussi, comme avec tous les objectifs bien lumineux, les zones de flous sont sujettes aux aberrations longitudinales (violet...
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.
Summary: A very sharp and well built lens. I tested my lens thoroughly when it arrived and found it to be sharp and contrasty even wide open. Very nice bokeh, but it does show slight chromatic aberration on high contrast areas, especially wide open.