Dan Fromm , Jul 26, 2006; 10:18 a.m.
If you want to use a lens in Minolta mount (AF, MD, makes no difference) on a body with Nikon F mount AND focus it to infinity, nothing has changed. Can't be done, will never be possible.
Nikon F flange to film distance is 46.5 mm. Minolta AF, 44.5; Minolta MD, 43.5. See http://www.a1.nl/phomepag/markerink/mounts.htm
What this means is that to use a lens in Minolta mount on a Nikon body, the mount adapter will have to have negative depth. This is achieved by putting a lens in the adapter, i.e., by using a sort of teleconverter.
Yes, one can string adapters together to hang nearly any lens on nearly any camera body. The cost is loss of the ability to focus on distant subjects. I once used two Novoflex adapters to hang a macro lens in Exakta mount on a Nikkormat. On the Nikkormat the lens' far focusing limit was ~ 1 m.
Tell your friend to use his Minolta lens on his Minolta SLR and be happy.