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Mars panorama from Mars-4 (2)
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Two optical-mechanical linear cameras swept out panoramas of Mars as the spacecraft passed by.
These were very similar to cameras later flown on Venera-9 and 10 Orbiters, but one of the Mars versions had a photomultiplier tube sensitive to infrared.
Apparently, no infrared panoramas were received from Mars-4 or Mars-5.
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