>In the AF fine tune menu, there is both a saved value and a >default value. Saved value is for individual lens, default is >the global value for all lens. > >If your saved value for individual lens is maxed out at -20, >then set the global default value also to -20. Then you have a >total of -40.
I have seen that claim made elsewhere, but I believe it to be incorrect. As far as I know, the "default" value is only applied when using a lens that does not have its own fine tune value saved.