Excerpt: I do a lot of aviation photography at air shows and aviation events. Including R/C model aviation events. I needed a good zoom for my Pentax mount, and this one is wonderful ! I add various filters as needed and have a great time composing pictures with this lens. AF is fast and I think very quiet.
Pros: Durable, Fast / accurate auto-focus, Lightweight, Rugged, Strong Construction
Excerpt: This lens works much better than I expected and is also more stoutly constructed than I thought it would be. The manual focus and zoom work smoothly and well and though it takes a little getting used to the macro setting is very useful.
Pros: Consistent Output, Durable, Easily Interchangeable, Lightweight, Strong Construction