The rating of a film's sensitivity to light. Though digital cameras don't use film, they have adopted the same rating system for describing the sensitivity of the camera's imaging sensor. Many cameras allow manual and or automatic of ISO selection. As a rule of thumb, the higher the ISO selected, the more degraded or grainy the picture.
ISO (International Standards Organisation) and is the international criteria for representing film sensitivity or speed. The higher the ISO number (eg. ISO 400) the greater the sensitivity.
A measure of a film's sensitivity to light. A 400 speed film is more sensitive to light than a 100 speed film. Consequently, the faster film is better suited for low-light photography. Unfortunately, faster films also create more noise and reproduce colors less accurately than slower films. Digital cameras either have a preset ISO sensitivity or they allow you to choose from a variety of film speed settings.
The emulsion speed (sensitivity) of the film as determined by the standards of the International Standards Organization. The most common ISO ratings are 800, 400 and 200.
The international standard for representing film sensitivity. The emulsion speed (sensitivity) of the film as determined by the standards of the International Standards Organization. In these standards, both arithmetic (ASA) and logarithmic (DIN) speed values are expressed in a single ISO term. For example, a film with a speed of ISO 100/21° would have a speed of ASA 100 or 21 DIN. The higher the number, the greater the sensitivity, and vice versa. A film speed of ISO 200 is twice as sensitive as ISO 100, and half that of ISO 400 film.
ISO (International Standards Organization) is a measure of light sensitivity based on an arithmetical progression. ISO 200 film is twice as fast as ISO 100 film but only half as fast as ISO 400. The scale is identical to ASA (American Standards Association). Generally, with higher ISO speeds there is more noise.
A rating of a film's sensitivity to light. Though digital cameras don't use film, they have adopted the same rating system for describing the sensitivity of the camera's imaging sensor. Digital cameras often include a control for adjusting the ISO speed; some will adjust it automatically depending on the lighting conditions, adjusting it upwards as the available light dims. Generally, as ISO speed climbs, image quality drops. See also: Sensitivity
An international standard measurement of film sensitivity. A more sensitive film (i.e., one that requires less light for an exposure) is called "high-speed", while a less sensitive one is "low-speed". Top of this page