Except if you mount an old, so called pre AI lens, on certain Nikons, you will have to disassemble the camera to get it off. Many modern Nikons can't autofocus older AF lenses due to not having a motor. And many AF film SLRs couldnt meter with manual lenses. So far from perfect compatibility.
Nikon F mount was introduced in 1959. The oldest mount used today is probably Leica M from 1954
