So I just bought the Sigma 50-150 f/2.8 from 2nd Trick (Stephen) and I must say I am pretty excited about this lens. The first thing I noticed when I put it on the camera is that the lens doesn't extend when you zoom...which I really like. Also, this copy seems tack sharp and very clean. It looks immaculate and seems to take very good pictures as well. First, here's a shot of the lens without the hood (as it covers up a lot of the lens itself): Here are some test shots I did just walking around the yard yesterday (at f/2.8 and f/8 just to see how it performs). First we have a shot of the flowers in front of my house at f/2.8. Next, the same shot, but at f/8 so we can see the change in bokeh. Here's a tulip at f/2.8 (good bokeh behind it) And the same shot but at f/8 Here are 2 more shots of tulips at f/2.8 with some excellent creamy bokeh behind them. No post processing on these shots at all, just converted to .jpg in Capture NX and resized for the web. I've lusted for a nice f/2.8 zoom for a while now and I'm glad to finally have one.