I decided to get a Sigma 17-70mm to replace my Canon 17-85. It turns out that it isn't so much of a party as it should be. A little background:
I have had the Canon 17-85 for a little over a month now and want to get rid of it because of horrific distortion, CA and OK picture quality. This is especially since most of my photos are taken at 17mm.
So I got the Sigma 17-70 today and was really excited, but when I tested it out, it has been giving me some stress. Pictures taken at 70mm look really bad, as if they are out of focus. It looks like there is some "shadowing". Is there something wrong with it? Please help me out.
Here are some examples:
Canon @ 70/5.6