Sigma 17-70mm 2.8-4.5?

I have this lens and it is one of the sharpest lenses I've ever owned. It's a great vacation lens. Before you buy, please check out www.keh.com this is a reputable company that sells used equipment and they are great. I have bought several lenses from them and they are always in better shape than they rate it. You can save a lot of money there.