The 500mm f/6 APO is the longest of Mamiyas 6x7cm format APO series lenses. It utilizes computer-aided design and Mamiyas ultra-low dispersion glass f

The 500mm f/6 APO is the longest of Mamiyas 6x7cm format APO series lenses. It utilizes computer-aided design and Mamiyas ultra-low dispersion glass for elimination of chromatic abberation. The extensive use of low dispersion glass makes APO lenses heavier and much more costly than standard design telephoto lenses.