Last Saturday I grabbed my T3i and my 70-200 2.8 IS and headed to a park here in Cleveland where there is a "castle" i set up on a tripod about 100' back turned off IS, and started shooting with the self timer. Started at 2.8 and 200mm and worked up to about f11 at 200 before going to 135mm, going through the aperatures again back to 2.8, then switched to 70mm. I didn't move the tripod during the testing, but did hit the back button focus each time just to make sure nothing changed. In viewing all images at 100% every photo taken at below f6 or so looked soft to me on my computer. even some above f6 looked soft based on the focal length. (the photos were of a rock wall on the front side of the castle, with a corner just to the right of the focal point so that I could get some impression of depth in the pics)
I only have DPP on my computer. How do I do a 100% crop so that I can post them here? I'm hoping that you guys can verify a potential focus problem, or just tell me I am nuts. I do know that I've seen photos posted here that look absolutely stunning and when I take similar photos they look fuzzy and not at all sharp in many cases.


