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. Includes built-in ringlight flash for shadowless photography. A close-up system designed especially for medical, dental, and scientific applications. Nikon Internal Focusing technology keeps the size of the lens unchanged as you focus. Continuous operation from a reproduction of 1:11 down to 1:1 life-size. Requires AC Power Unit LA-2 (#4506) or DC Power Unit LD-2 (#4505) for flash operation. Accepts 49mm filters. Wt. 31.4 oz. Dim. 3.9" x 5.6".