70 mm film

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70 mm film (or 65 mm film) is a wide high-resolution film gauge, with higher resolution than standard 35 mm motion picture film format. As used in camera, the film is 65 mm (2.6 in) wide. For projection, the original 65 mm film is printed on 70 mm (2.8 in) film. The additional 5 mm are for magnetic strips holding four of the six tracks of sound. Although more recent 70 mm prints now use digital sound encoding, the vast majority of 70 mm prints predate this technology. Each frame is five perforations tall, with an aspect ratio of 2.20:1. The vast majority of movie theaters are unable to handle 70 mm film, and so original 70 mm films are shown with 35 mm prints at these venues, in the regular Cinemascope / Panavision aspect ratio of 2.35:1.



Film formats with a width of 70 mm have existed since the early days of the motion picture industry. The first 70 mm format film was most likely footage of the Henley Regatta, which was projected in 1896 and 1897, but may have been filmed as early as 1894. It required a specially built projector built by Herman Casler in Canastota, New York and had a ratio similar to full frame, with an aperture of 2.75 inches (70 mm) by 2 inches (51 mm). There were also several film formats of various sizes from 50 to 68 mm which were developed from 1884 onwards, including Cinéorama (not to be confused with the entirely distinct "Cinerama" format), started in 1900 by Raoul Grimoin-Sanson. Two other formats, Panoramica and 20th Century Fox's Grandeur, began distribution in 1929 and 1930, respectively.

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