70-mm-Film

70 - mm film (or 65 mm film ) is a film format for movies. Corresponding 70 -mm roll film is also used in medium format photography. Film strips of more than 35 millimeters in width are generally referred to as a wide film. This movie format is only very rarely used for feature films, and if so, then often only for special recordings or parts of a film.

Standardized format

Compared to the normal image (" Academy" ) on plain film of about 350 mm ² size provides the image on 70- mm film more than three times as much surface area and thus more detail and scope for higher magnifications, so larger screens. The aspect ratio is similar with the 2.2:1 cinemascope without the need for anamorphic lenses.

To edit is made a 70 -mm positive from a 65 mm negative in general. The negative can be narrower since must match only at the positive four Magnettonstreifen. In early processes such as Alberini Panoramica or Fox Grandeur 70 mm negatives were used in Europe and in the USA. In the former Eastern bloc countries, however, the combination of 70 -mm and 70 - mm original copy was retained (eg DEFA 70 and Sovscope -70). The currently available 65/70-mm-Verfahren are Panavison Super 70, CineSpace 70 ( Todd -AO) and Arriflex 765

A special feature is the Special Venue Process 70 mm 8 / 70th In this format 70 mm film is a picture of eight perforations used with vertical film running. This is the aspect ratio of 1,26:1, which is listed in special movie theaters with flat or slightly curved screen walls ( 180 -degree cinema in Omnivision ).

Other methods that use 70 - mm film, are MaxiVision (10 perforations ) and IMAX (15 perforation holes with a horizontal film running ).

DTS is the only system that includes a digital 70 -mm sound format. It thus offers a replacement for the expensive and both copy works as well as movie theater -maintenance 70 - mm magnetic sound. This offer could be on the market despite a possible significantly better sound quality for the moviegoers not prevail.