The 210mm f/4.5 APO is the shortest of Mamiya's 6x7cm format APO series lenses. It utilizes computer-aided design and Mamiya's ultra-low dispersion glass for elimination of chromatic abberation. The extensive use of low dispersion glass makes APO lenses heavier and more costly than standard-design telephoto lenses. Typically, lenses over 200mm focal length show decreased sharpness, resolution and color saturation due to increased chromatic aberration, especially at wider apertures. The Mamiya APO Series is specifically designed to give the utmost performance in telephoto design lenses, yielding consistent, unparalleled image quality. Equivalent to 102mm in 35mm format.