I would be extremely appreciative if anyone has a solution to this problem:
The Canon 5D Mark III sets its default focus point at the centre, but has many focus points for users to choose from. I've been trying to use some of the off-center points. However, every time I changed the focus point (by moving the red square away from the centre to one of the off-center points), as soon as I press "focus", the red square would shift back to the centre, and centre becomes focused instead of where I want the focus to be! And as soon as I release the focus button, the red square would return to the focus point I chose! I've tried this with 3 different lenses, all producing the same result. The Canon Technical Hotline said that it is most likely an issue with the camera settings, and advice that I reset everything to factory default. However, this would mean deleting all my other settings too. Does anyone have a more simple solution (and may be even an explanation) for the problem?
Many thanks in advance for your advice!!