Special Purpose Lenses. While Nikkor lenses are noted for their versatility, certain special photographic applications, such as perspective-controlled 35mm architectural photography, require unique design characteristics. Nikon offers a complete line of Special Purpose lenses to fit every need. Features unique Nikon Defocus-image Control technology, which allows you to control background and foreground blur for striking portraits. Autofocus capability. Large maximum aperture for shooting in dim light. Accepts 72mm filters. Built-in lens hood.