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This is a 2.65-power lens for use on the Bausch & Lomb Zoom 240 Stereoscopic Viewer on the Cutler Hammer AIL 1540 light table. This light table was used by the U.S. intelligence community to analyze film from photoreconnaissance satellites and aircraft beginning in 1971. In contrast to earlier light tables, the AIL 1540 had motorized film drives, microscope mounts, and elevation control. It could handle 70 mm and 5 inch, 6.6 inch and 9 inch wide film, and permitted the viewing of two stereo rolls simultaneously. Despite the introduction of computerized systems in 1981 to process imagery returned digitally from photoreconnaissance satellites and aircraft, light tables such as the AIL 1540 are still used today with older imagery that has never been digitized.

The National Geospatial-Intelligence Agency transferred this artifact to the Museum in 2004.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin United States of America Type EQUIPMENT-Photographic Manufacturer Bausch & Lomb Optical Co.
 Dimensions Overall: 2 5/16in. x 2 3/16in. x 1 9/16in. (5.9 x 5.6 x 4cm)
 Materials Anodized Aluminum, Glass, Steel, Paint, Paper, Adhesive
 Inventory Number A20050092009 Credit Line Transferred from the National-Geospatial Intelligence Agency Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.