What is the use of ISO
ISO explained in detail - the sensitivity of cameras to light
Everyone has heard of it before, but its meaning is less well known: the ISO specification. In addition to aperture and exposure time, this plays a very important role in both analog and digital photography.
The ISO specification was already of great importance in analog photography. There the ISO value stands for the film sensitivity and indicates how sensitive the inserted film is, i.e. how much light is required for taking photos. The photographer had to be clear about the lighting conditions before starting his project, because it was difficult to change the film in the meantime.
Things are easier with modern digital cameras. Here, the ISO setting provides information on how sensitive the image sensor is to light. The ISO values can be changed in the settings menu and thus always adapted to the current lighting conditions. In addition, many digicams offer the option of automatic ISO setting. The camera always tries to choose the right option itself.
The abbreviation ISO stands for International Organization for Standardization, an international association of national standardization organizations. Before it was founded, national abbreviations were used for film speeds. For example, there was information on old films such as DIN (German Institute for Standardization) or ASA (American Standards Association). Nowadays only the internationalized ISO value is given.
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