Launched in 1965 by Eastman Kodak at the 1964–65 Worlds Fair, Super 8 film comes in plastic light-proof cartridges containing coaxial supply and take-up spools loaded with 50 feet (15 m) of film, with 72 frames per foot, for a total of approximately 3,600 frames per film cartridge. This is enough film for 2.5 minutes at the professional motion picture standard of 24 frames per second, and for 3 minutes and 20 seconds of continuous filming at 18 frames per second (upgraded from standard 8 mm 16 frame/s) for amateur use. In 1973 the system was upgraded with a larger cartridge, which includes film with magnetic sound.
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