Well, I decided not to upgrade, but now of course I have a problem with my camera. It will no longer auto-focus. I have the kit lens (18-55mm) and then I recently bought the 50mm f1.8 lens which I can only manual focus with anyway. I just switched my lens back over to the 18-55 and now it won't autofocus. I tried an 18-70 lens that my boyfriend owns and it autofocuses fine. Any suggestions?