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The ISO arithmetic speed has a useful property for photographers without the equipment for taking a metered light reading. Correct exposure will usually be achieved for a frontlighted scene in bright sun if the aperture of the lens is set to f/16 and the shutter speed is the reciprocal of the ISO film speed (e.g. 1/100 second for 100 ISO film).
Film speed describes a film's threshold sensitivity to light. The international standard for rating film speed is the ISO scale, which combines both the ASA speed and the DIN speed in the format ASA/DIN. Using ISO convention film with an ASA speed of 400 would be labeled 400/27°. [29]
In 2013, the MPA ratings were visually redesigned, with the rating displayed on a left panel and the name of the rating shown above it. A larger panel on the right provides a more detailed description of the film's content and an explanation of the rating level is placed on a horizontal bar at the bottom of the rating.
GN = distance × f-number. One needs to specify the film or sensor ISO speed, and it is conventional to quote for ISO 100/21°. The distance can be in feet or in metres, the units to be specified. [4] GND: Graduated neutral density. A type of neutral density filter in which brightness is reduced more on one side of the filter than on the other ...
Professional color film with ultra fine grain. The 125 ISO was a poor seller and replaced by a 100 ISO film: US: 135, 120: Ektar 100 (1991) Kodak: Ektar 1000: 1989–1997: T: 1000: C-41: Print: Professional color film with ultra fine grain. 135 format discontinued in 1994: US: 135, 120: Royal Gold 1000 Kodak: Ektar 100: 1991–1997: T: 100: C ...
Those that affect the camera's non-aperture-related light sensitivity; namely lens filters and the ISO rating of the film/imaging sensor. Changing either the f‑stop or the flash-to-subject distance does not affect guide numbers because, by definition, choosing a different value for one factor is automatically accompanied by a reciprocal ...
For photographic film, sensitivity is referred to as film speed and is measured on a scale published by the International Organization for Standardization (ISO). Faster film, that is, film with a higher ISO rating, requires less exposure to make a readable image. Digital cameras usually have variable ISO settings that provide additional ...
The CAS code shows this is (top row) ISO 125 film, (bottom row) 24 exposures, +3/−1 f-stop exposure tolerance. The DX barcode reads 017563, showing DX number 109-12, 24 exposures. DX ( D igital inde X ) encoding is a standard for marking 35 mm and APS photographic film and film cartridges, originally introduced by Kodak in 1983.