Now we all know there was this thing called the Cold War where we did all kinds of high-altitude surveillance on other countries. The SR-71 spyplane could fly at 81,000 feet. Apparently it was possible to image the ground from airplanes at high altitudes, and I'm pretty sure this was before the era of the CCD. I remember seeing grainy images on the History channel depicting the supposed missile silo's in Cuba that sparked the Cuban Missile Crisis. All this must have been shot on film. Does anyone know what kind of films and lenses and cameras were used for airborne surveillance? Was it color negative film that they used to capture such important images from so far away?