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interesting article https://www.thedrive.com/the-war-zone/beale-air-force-base-finally-says-goodbye-to-film-for-its-u-2-spy-planes https://www.af.mil/News/Article-Display/Article/138474/sensor-shop-ensures-successful-u-2-missions/ “Each roll of OBC film is 5 inches wide and 10,500 feet long with each frame of imagery measuring more than 6 feet long... With an entire roll of film, the camera can take about 1,600 frames in one mission. Each frame covers roughly 110 square nautical miles in a panoramic horizon-to-horizon format. Basically, a roll of film can shoot an area the size of Colorado... When the OBC was on the SR-71 it took a frame about every 1.7 seconds, but for the U-2 it was slowed down to one frame every 6.8 seconds... This had to be done because the difference in the cruising speeds of the aircraft could cause the imagery to blur if the timing and speed of the camera was wrong." "The OBC could return into service as needed and will remain available when called upon. As of now, no perfect digital replacement has been developed. Digital imaging technology doesn't quite match the resolving power of the OBC."