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Spy in the Sky: The KH-9 Hexagon

Open Access Open Access


The United States’ KH-9 Hexagon was arguably the most complicated film-based reconnaissance satellite ever put into orbit. Nearly a quarter century after its final launch, the U.S. government has declassified the mission. Hexagon camera-designer Phil Pressel shares the no-longer-top-secret details.

© 2013 Optical Society of America

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