I was just wondering if anyone here has the Tamron 17-50 2.8 (non-vc version) and how they like it? It seems to have gotten pretty good reviews and I'm looking for some sort of cheap walk around lens. I have a Canon 7D and I wanted a "walk-around" lens. I have a sigma 30 1.4 and 50 1.4 that I use the majority of the time, but there are some instances where I want the convenience of a zoom. If anybody has any other options, please suggest them. I'm not really looking to spend over $400, as I'm looking to get an UWA lens too besides this lens so I don't want to burn too much cash on a walk-around lens, and I'll most definitely be looking at find a nice used lens. Thanks.