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[i]The average distance from the Hasselblad cameras to the service module for the onboard photography was about 410 feet for magazine R and about 880 feet for magazine N, resulting in an image scale of 1:1500 and 1:1077, respectively. Of the frames showing the service module, orientation was such that the majority do not show bay 4, and at no time are the sun angle and camera view simultaneously directed into bay 4. In an effort to draw detail out of the high density in the area of the normal location of the cryogenic oxygen tank 2 in bay 4, two black and white frames (AS13-59-8500 and -8501) and three color frames (AS13-58-8462, -8464, and -8465) were subjected to photographic processing enhancement for specific details. These same frames were also subjected to electronic scanning with an image digital construction technique similar to that used on the Surveyor lunar surface photography. Assisting the Photographic Technology Laboratory at the Manned Spacecraft Center were the Jet Propulsion Laboratory, McDonnell-Douglas Corporation, LogEtronics Incorporated, Ciba Corporation, and Data Corporation with their specialized techniques, facilities, and experienced personnel. After exhausting all means of enhancement from the masters, the original film was taken to Data Corporation, Dayton, Ohio, to be scanned with their high-intensity, 1-micron probe and digitally reconstructed to bring out the detail for analysis.[/i]
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