CORONA spy satellites (Mission 1101). First mission of the KH-4B (Key Hole 4B) type. Resolution improved to 2 m. The camera could also handle color film (at lower resolution and rarely used for this purpose, but useful for spotting camouflage techniques) and high-speed film. Many of these technologies would later be adopted for meteorological satellites (Landsat in particular) and interplanetary probes (starting with Mariner, Pioneer, and Voyager).
