So i've been struggling with this issue for a little while also... i havent tested this yet but i can already tell this is my problem with my 17-55... its just no longer sharp. I also use a 70-200 f/2.8 L thats sharp as a tack... thats how it was easy to tell my 17-55 between 17-25mm was having issues.


I have a 30D that apparently does not have AF MA... now what?