I just purchased a practically brand new 24-105 L (was told it was only used three times and kept in a safe)
Everything checks out except when focusing, I get an uncomfortable grainy grinding noise. What sounds like there is some sand or dirt underneath the actual focusing ring, not the glass.
Is this a major issue and can a local camera shop help with this or will it need to be sent to Canon?
I really hope this isn't a huge problem, I love this lens!
Update: There is definetly sand or something in it. There are new a few particals in the lens itself....