11-07-2017 12:26 PM
11-07-2017 02:27 PM
Did Canon perform the professional cleaning? If not (or, I suppose, even if) the AF might have been knocked out of whack. You should send the camera and lens to Canon for a check.
Use somethng like a lens align - even a yardstick at 45 degrees at 50x the focal length to check for front/back focus.
11-07-2017 04:25 PM