Nikon has released its first mirrorless cameras to somewhat mixed reviews. However, whether people like them or not, the mirrorless camera is the most significant shift in Nikon’s product line since auto focus and some speculate that it is the future of Nikon’s product line. Digital Trends Just like when Nikon introduced auto focus several decades ago, Nikon lenses are eternal.  Fortunately, an F-Mount adapter enables the use of just about the entire line of Nikon’s F-Mount NIKKOR lenses with the new camera. Notwithstanding what would appear to be an inevitable shift in the product line…