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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 ...
is the ASA arithmetic film speed K {\displaystyle K} is the reflected-light meter calibration constant Use of the symbol B {\displaystyle B} for luminance reflects photographic industry practice at the time of ASA PH2.5-1960 ; current SI practice prefers the symbol L {\displaystyle L} .
Ultra high speed (for its time) panchromatic film. Although rated at ASA 640 / 29 DIN, best results were obtained at ASA 2000 / 34 DIN, very similar to how Delta 3200 film is officially rated at ASA 1000 / 31 DIN but is usually shot at ASA 3200 / 36 DIN. Germany: 135, 120, 127, 620? Agfa: Isopan SS: 1935–c1960s: T: 100: B&W: Print
A logarithmic system for expressing film speed in common use in Europe since 1934. Now combined with the ASA linear system, in the form of the ISO system. [4] DOF or DoF: Depth of field. A measure of the permissible distance within which an object remains in acceptable, though not perfect, focus. [11]
An early change in ASA (ISO) speed from 200 to 400, around 1960, was due to a change in the ASA standard rather than the film. In 2007 [citation needed], Tri-X was extensively re-engineered, receiving the new designation 400TX in place of TX or TX400, and became finer-grained. The amount of silver in the film stock was reduced. [6] [7]
The sunny 16 rule can be used in varying light by setting the shutter speed nearest to the ISO film speed and f-number according to a generalized exposure table, as: [3] [4] Tessina with exposure guide plate from the 1960s. At that time, DIN 21 was equivalent to ASA 80. After 1983, DIN 21 was ASA 100. [5]
Kodachrome was first sold in 1935 as 16 mm movie film with an ASA speed of 10 [20] [21] and the following year it was made available as 8mm movie film, and in 135 and 828 formats for still cameras. [22] In 1961, Kodak released Kodachrome II with sharper images and faster speeds at 25 ASA. [23] In 1962, Kodachrome-X at ASA 64 was introduced.
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