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Given they developed a special version of an aircraft, just for high altitude PR, I would be amazed if the kit wasn’t certified to the rated ability. Also would suggest the published altitude performance would actually be incorrect, as it was published at the height of the Cold War. These were the days of huge Defense expenditure. Also the cameras were pretty bullet proof, the only thing that’s happening is further temperature change, and Heating, and insulated curtains were provided to prevent any issues.