When Nikon announced its Z Series full-frame mirrorless camera system last year, it called the Z mount “the new light that Nikon will use to pioneer the future.” In its new push toward mirrorless dominance, Nikon will reportedly be ending at least 1/3 of its F-mount DSLR models. Nikon currently has 8 active DSLR models in its latest F-mount lineup: the D5, D850, Df, D750, D500, D7500, D5600, and D3500 (ordered from high-end to entry-level). Nikon Rumors is hearing from…