I completely agree with this comment. I have the 16-35 f/4L on my 60D and love it. Sure, you can get wider with the 10-22, but 35mm is an awesome walk-around focal length on a crop body. I've never found a reason to go wider than 16 - be it in a tigh...
If the lens has IS, have you turned it off? If IS is on and the camera is mounted to a tripod, often times the IS tries to compensate for non-existent motion.
