70 mm film (or 65 mm film) is a wide high-resolution film gauge for motion picture photography, with a negative area nearly 3.5 times as large as the standard 35 mm motion picture film format. As used in cameras, the film is wide. For projection, the original 65 mm film is printed on film. The additional 5 mm contains the four magnetic strips, holding six tracks of stereophonic sound. Although later 70 mm prints use digital sound encoding (specifically the DTS format), the vast majority of existing and surviving 70 mm prints pre-date this technology. Each frame is five perforations tall, with an aspect ratio of 2.2:1. However, the use of anamorphic Ultra Panavision 70 lenses squeezes the image into an ultra-wide 2.76:1 aspect ratio. To this day, Ultra Panavision 70 produces the widest picture size in the history of filmmaking; surpassed only by Polyvision, which was only used for 1927's Napoleon. With regard to exhibition, 70 mm film was always considered a specialty format reserved for epics and spectacle films shot on 65 mm and blockbuster films that were released both in 35 mm and as 70 mm blow-ups. While few venues were equipped to screen this special format, at the height of its popularity most major markets and cities had a theater that could screen it. Some venues continue to screen 70 mm to this day or have even had 70 mm projectors permanently or temporarily installed for more recent 70 mm releases. History Films formatted 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 by . 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. In 1914 the Italian Filoteo Alberini invented a panoramic film system utilising a 70 mm wide film called Panoramica. Fox Grandeur In 1928, William Fox of the Fox Film Corporation, in personal partnership with Theodore Case as the Fox-Case