I'm referring to your above comment.
anyway, when Nikon and Canon produce their FIRST professional body, Nikon call it Nikon F, and Canon call it Canon F1,
so the succeeding Nikon pro body is Nikon F2 instate of Nikon F1, it is not a rule, but a tradition.
Well, alright then. My comment was simply to highlight the fact that the naming of a product can be somewhat arbitrary. I guess it was never made clear.