I read the manual but it doesn't really get to this particular point. I just calibrated 3 lenses, 70-200/2.8VR, 85/1.8 and 35/1.8. Had had focus issues with the first 2. Went through the menu and took several shots at different fine tune adjustments etc. Pics look better. The part that puzzles me is the "default" setting versus the "saved" setting. For the 70-200 the default says +3 while the saved value is -3. When I open List Saved Values all 3 lenses appear, followed by _ _. For the 85 the default is +3 while the saved value is -5. So if I have this right, this D300 with these specific lenses will AF at the saved value. If I borrow someone else's lenses of the same type this D300 will automatically AF the default? Not that I borrow lenses, but do I need to set the default to 0? Thanks.