So I pulled out my 50mm f/1.4, put it on the camera and it wouldn't auto-focus. I tried manually focusing and it didn't feel as smooth as it used to. I looked closely and the distance indicator wasn't turning nor was the lens moving in and out. It looks like the part that moves the front element in and out is pushed in flush with the rest of the lens. I don't remember it ever being flush. It's borked. Should I send it back to Canon or see if any of the local shops can fix it? Any idea on a cost estimate?