The Apollo Panoramic Camera (APC) was mounted in the Scientific Instrumentation Module of Apollos 15, 16 and 17. Itek built the panoramic camera for NASA to be used in the scientific mapping done during the final three Apollo missions. The camera provided high resolution photography along orbital groundtracks. The camera, which could operate in stereo mode, was mounted on the service module and recorded images on a film cassette. The cassette was then retrieved by the Command Module Pilot during an extravehicular activity (EVA) during the trans-Earth portion of the mission. The camera is a direct technological descendent of the Itek camera used in the U-2 photo reconnaissance programs.