Canon Community

Hi! I sent out my 1DX to be cleaned and the focus looked at, and I got it back the day before yesterday. I tried using it yesterday and the AF does not work. It is not tracking or focusing at all. I have a message popping up I have not seen before st...

Has anyone encountered back focusing on this lens at 200mm and 2.8? I tested it twice and each time it seems to focus a few inches in front of the subject?  The lens is brand new.