> You can add any lens to any camera almost. NO other camera manufacturer canmake that claim.
How about Hassy, Leica in terms of backward compatibility?
Indeed - you can use almost any Leica screw-mount lens on any screw mount body or M mount body AND get metering (where available) and rangefinder focus coupling. The only exceptions are lenses that project backwards too far, such as my 35mm Jupiter Biogon copy which won't mount on the new Voigtlander bodies (but that's Cosina's design fault, hey?).
So there.
AndrewF
(digital L39 body - please!)