ISO

ISO stands for "International Standard Organisation", which is an international committee for the definition of worldwide standards for the sectors computer technology and also photography. In the sector of photography ISO describes light sensitivity of an image converters or films. Standard ISO-values range between ISO 25 and ISO 6400. At a high ISO-setting the film (or image converter) needs little light for the creation of a photo as compared to a low ISO value. In contrast to films, image converters have a fixed light sensitivity. Is the image signal strengthened however, a high light sensitivity can be simulated.

ISO-Value

The ISO-Value shows the light sensitivity of the sensor. While the ISO-Value in analog photography results out of the light sensitivity of the used film, it can be controled by software in digital photography. The denotation "ISO" stands for "International Organisation for Standardisation" and is an international norm. Common ISO-Values are 50 to 1600, whereas a small value stands for low light sensitivity, a high value denotes high light sensitivity. Starting with ISO 50, the light sensitivity doubles towards the next step up: ISO 100 is two times as sensitive to light then ISO 50, ISO 200 twice as sensitive as ISO 100 and so on...