Raid is right. The problem arises when the register of the guest lens you want to use is shorter than the lens register of the host body. In that case, the extra extension will keep the lens from focusing to infinity w/o optical (glass) tricks. When the register of the guest lens is longer than the lens register of the host body, all you need for infinity focus is something that allows the lens to sit at its own lens register distance -- a thicker adapter. This does not transfer diaphragm linkages, of course.
He's also right, that with the cost of film cameras now, it is likely to be a better deal to buy a Nikon body.
I know, it makes me cry, too. I love the F1.