Eliminating intensity variations while creating even illumination profiles in optical systems, the company’s continuously variable apodizing filters can either increase or decrease radially from light to dark or dark to light. Both bull’s-eye and reverse bull’s-eye type filters are available in two standard diameters. The bull’s-eye type filters feature a high optical density in the center, which decreases continuously to an uncoated edge, while the reverse bull’s-eye type filter features a high optical density coating on the edge of the filter, which increases continuously to an uncoated center. Standard bull’s-eye type filters are available in 25- and 50-mm diameters with end densities of 1 and 2, a dimensional tolerance of +0.00/-0.2, surface quality of 60-40, and a thickness of 1.5 +0.1. A wide variety of custom substrates, sizes, and intensity profiles are also available. Edmund Optics Inc., Barrington, NJ. (800) 363-1992.