The Bausch & Lomb Zoom 500 Imagery Analysis Station is the first production unit designed as a system incorporating viewing optics and light table for the specific purpose of detailed photointerpretation of aerial photography. This system integrates the newest Zoom 500 high performance stereoscope with the latest in light table illumination systems, the high intensity ring illuminator, to provide a total system offering the ultimate in optical performance, illumination and human engineered operator comfort. The Zoom 500 Stereoscope was conceived and designed to supplement the Zoom 240 and has features which makes it especially appealing to the photointerpretation community. The light table was conceived around the high intensity ring illuminator, which provides an order of magnitude increase in illumination intensity over standard light tables, at a fraction of the power consumption. The Zoom 500 Imagery Analysis Station integrates these two into a modular system which, for the first time, addresses human factors engineering as a major design parameter. The resulting Zoom 500 IAS has proven to be a significant advance in the field of photointer-pretation.