An optical bar camera is a type of long focal length camera used for panoramic images eg for high-altitude or satellite reconnaissance.
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Itek KA-80
Itek KA-80/A used in A-12, Lockheed U-2 and SR-71 reconnaissance aircraft.
Apollo Panoramic Camera
Itek KA-80A derivative with 24" focal length used in Apollo program to map parts of the moon. Used on Apollo 15-17.
Perkin-Elmer KH-9 OBC
See Optical Bar Cameras
References
Optical Bar Camera Wikipedia(Text) CC BY-SA