unlike most of the other manufacturers involved in 35mm camera production, the nikon f was released with a full range of lenses from 21 mm to 1000 mm focal length. nikon was also among the first to introduce what is commonly known today as 'mirror lenses' – lenses with catadioptric system designs, which allowed the light path to be folded and thus yielded lens designs that were more compact than the standard telephoto designs. subsequent top-of-the-line nikon models carried on the f series, which has reached the f6 (although this camera has a fixed pentaprism). with the introduction and continued improvements being made in digital photography, the nikon f6 is likely to be the last of the flagship nikon f-line film slrs.