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The ASA scale is a linear scale, that is, a film denoted as having a film speed of 200 ASA is twice as fast as a film with 100 ASA. The ASA standard underwent a major revision in 1960 with ASA PH2.5-1960, when the method to determine film speed was refined and previously applied safety factors against under-exposure were abandoned, effectively ...
The amount of silver in the film stock was reduced. [6] [7] Tri-X also exists as a reversal film for the 16 mm and Super-8 cine film formats. The speed for tungsten lighting (3200 K) is ISO 160 and for daylight ISO 200 when processed as reversal. It can also be processed as a negative at a small loss of speed while the grain will be slightly ...
35 mm film is a film gauge used in filmmaking, and the film standard. [1] In motion pictures that record on film, 35 mm is the most commonly used gauge. The name of the gauge is not a direct measurement, and refers to the nominal width of the 35 mm format photographic film, which consists of strips 1.377 ± 0.001 inches (34.976 ± 0.025 mm) wide.
The film speed codes are in binary order if the first three bits (S1, S2, S3) are considered to identify a trio of film speeds and the last two bits (S4 and S5) are considered an adjustment of +0, + 1 ⁄ 3, or + 2 ⁄ 3 stops within that trio. For example, ISO speed 25/15° is encoded as 00010, while 32/16° is 00001 and 40/17° is 00011.
Silent film has no standard speed; many amateur formats have several common speeds, but no standard. Negative lenses indicates whether spherical (normal) or anamorphic lenses are used on the original camera negative, and if anamorphic lenses, what anamorphic power is used. Projection gauge is the film gauge (width) used for the release print.
It was not named Autoreflex, but has the TC in its name and its functionality remembers the Autoreflex TC; the innovation was the detection of film speed by the DX-system. [18] The TC-X was small for a SLR (width x height x depth: 130 x 84 x 45 mm) and (for a SLR) very light (375 g), [19] because a plastic-housing was used. [2]
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The list below is of 35mm film stocks in use in 1956. [18] Ansco Color Negative, Type 844. E.I. 16 Day (w/ Wratten #85 filter), 25 Tungsten (discontinued) Ansco Color Dupe Negative, Type 846, for Intermediate Negatives (discontinued) Ansco Color Print Film, Type 848, for release prints, balanced for approx. 3,000 degrees K (discontinued)