pigpen wrote:
There is a feature in the 7D that allows you to make focusing adjustments. Once you do it, the camera saves the info and makes the adjustments every time you put that lens on. I just got my 7D a few days ago, so I can't be much help on exactly how to do it.
I have already given you a link to the Nikon site on how to do fine tuning - it doesn't matter what brand of camera you have. The Canon 7D manual has it on page 211.