My wonderful Canon 85mm 1.2L seems to have a serious problem! The autofocus is trickling along and taking about 20sec to focus, I'm guessing its a fault with the USM. Is this a big repair job?
Are you in CPS? If so, pop up to Elstree (if you can) and have a word with them and see what they think. I have found them very helpful to deal with, especially in person.
The USM broke in my Canon 50 f/1.4 just last week. I couldn't believe it, the lens was used so gently and carefully. After not using it for awhile, I took it out of my bag, and it just wouldn't autofocus at all.
I walked it over to phototech, a camera/lens repair shop near me. It ended up costing $150 to be fixed, I haven't received the new lens yet.
