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This is a 7" aperture, duel focal length system for use on electro-optical tracking pedestals and tracking radars. It is used in conjunction with "C" mount video cameras and utilizes the proprietary D.O.S. Optical Front End design. This feature guarantees boresight retention and qualifies it's use for Star Calibration in addition to T.V. Auto-Track and the recording of all phases of mission profile.