Excerpt: I used this lens mostly for wildlife and quite rarely for portraits and landscapes. The lens is relatively cheap and is probably most compact 300mm lens I ever seen. Sharpness is not perfect but it worth lens price, especially when compared to old Pentax zooms like 100-300 and 80-320. My sample bought as new had some hood slosh. Second sample that I reviewed at shop had much worse CA than mine.
Excerpt: I bought this lens along with K-X used. With my k-x this was an OK lens.. i tried to get rid of it many times. Basically because, it was very difficult to focus and at longest reach it was soft. But, then swapped my k-x with k-30. With better iso management, i am starting to love this lens. Still, the AF issue is there, but i am loving the colors and it is a breeze to take candid shots of people.
Excerpt: Having just bought the K-5 IIs to see if it improves image quality over my "other" D-SLR, which is 18 Mp, BTW, I went for th 55-300 as a more practical "starter lens" for wildlife and general shots. My very first day was not at all disapointing for this lens, giving me some much sharper images than my more expensive D-SLR and "big" 150-400 lens. Apart from initial test shots, my first 3 shots outddors bagged me 3 very useable Nuthatch pic's.
Pros: Light, well built and "tight", sharp, versatile, not a bad price.