Measure of a photographic film's sensitivity to light
Not to be confused with frame rate.
"Slow film" redirects here. For the genre of films, see slow cinema.
This film container denotes its speed as ISO 100/21°, including both arithmetic (100 ASA) and logarithmic (21 DIN) components. The second is often dropped, making (e.g.) "ISO 100" effectively equivalent to the older ASA speed. (As is common, the "100" in the film name alludes to its ISO rating.)
Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system introduced in 1974. A closely related system, also known as ISO, is used to describe the relationship between exposure and output image lightness in digital cameras. Prior to ISO, the most common systems were ASA in the U.S. and DIN in Europe.
The term speed comes from the early days of photography. Photographic emulsions that were more sensitive to light needed less time to generate an acceptable image and thus a complete exposure could be finished faster, with the subjects having to hold still for a shorter length of time. Emulsions that were less sensitive were deemed "slower" as the time to complete an exposure was much longer and often usable only for still life photography. Exposure times for photographic emulsions shortened from hours to fractions of a second by the late 19th century.
In both film and digital photography, the use of higher sensitivities generally leads to reduced image quality (via coarser film grain or higher image noise). Generally, the higher the sensitivity, the grainier the image will be. Ultimately sensitivity is limited by the quantum efficiency of the film or sensor.
To determine the exposure time needed for a given film, a light meter is typically used.
Filmspeed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most...
filmspeed 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...
In photography, shutter speed or exposure time is the length of time that the film or digital sensor inside the camera is exposed to light (that is, when...
Most silent films are poorly preserved, leading to their deterioration, and well-preserved films are often played back at the wrong speed or suffer from...
professionally as Carol Speed, was an American actress, singer-songwriter and author. Speed was best known for her roles in films during the 1970s blaxploitation...
tab to sense filmspeed, enabling sophisticated cameras to switch between high- and low-speedfilm. A short tab indicated high-speedfilm, and a long tab...
Positive Film Developing Outfit") for reversal processing of its now-discontinued Panatomic X film, which doubled the effective filmspeed from 32 to...
speed to the [reciprocal of the] ISO filmspeed [or ISO setting] for a subject in direct sunlight." For example: On a sunny day and with ISO 100 film...
for the four most popular filmspeeds. The 135 film has been made in several emulsion types and sensitivities (filmspeeds) described by ISO standards...
barcode encoding the film format and length as well as the filmspeed and type is located on the sticker between the emulsion carrying film and the backing...
resolution of film images depends upon the area of film used to record the image (35 mm, medium format or large format) and the filmspeed. Estimates of...
Speed Kills is a 2018 American crime drama film directed by Jodi Scurfield and starring John Travolta. It is based on Arthur J. Harris's book of the same...
of 35 mm film in 135 format Kodak introduced the DX encoding method on 3 January 1983. In contrast to former solutions like Fuji's filmspeed encoding...
and Speed Racer premiered on American television in the summer of 1967. In the series, Speed's full name was Go Mifune, in homage to Japanese film star...
starring in Jan de Bont's action filmSpeed (1994). In 1995, Bullock founded her own production company, Fortis Films, and starred in the romantic comedy...
large market share. Lumière reformulated its stock to match the speed of Eastman film, naming it 'Etiquette Violette' (Violet Label). Blair sold his English...
expanded into other forms of media including a film adaptation and licensed Hot Wheels toys. The Need for Speed series was originally developed by Distinctive...
Global Information