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The K-20 is an aerial photography camera used during World War II, e.g., from the Enola Gay's tail gunner position of the mushroom cloud over Hiroshima. Designed by Fairchild Camera and Instrument, approximately 15,000 were manufactured under licence for military contract by Folmer Graflex Corporation in Rochester, NY between 1941 and 1945. The K-20 uses a 5.25"x20 to 5.25"x200 foot Roll Film, with an image size of 4x5 inches. Lenses were 6 3/8" f/4.5 with an adjustable diaphragm and were non interchangeable, these were made by Kodak, Ilex, or Bausch & Lomb, as available at the time of order. The camera featured the use of a vacuum to keep the film flat.
Earlier aerial cameras, from the World War I era, included the Kodak K1, with focal plane shutter, the Fairchild K3, K3A, K3B etc., with in-lens shutter to eliminate distortion, K5 etc., some of which used individual glass plates, some individual sheet film, and some roll film.
Similar cameras, from the World War II era: K17, K18, K19, K21, K22, F20, F40, F56, etc., many making 9" x 9" or 9" x 18" images using 9"+ roll film.