I was shocked to have learned about the AF inconsistency that is apparently innate to the 17-55... I would've shrugged it off as F.U.D., but it mirrors my own experience with the lens. Up until recently, I still had some abnormally blurred photos made with that lens (because I was not duly diligent when culling the photos the first time around). I blamed it all on the camera, the 30D which I hated anyways, but in hindsight... it may not have been entirely its fault, even though that behaviour continued with other lenses after the 17-55 went to the marketplace and never returned...
See the post by user "Archibald": https://www.fredmiranda.com/forum/topic/...1#14032601 and my reply on page 3.
See the post by user "Archibald": https://www.fredmiranda.com/forum/topic/...1#14032601 and my reply on page 3.