ISO (International Organization for Standardization) is a numeric term which designates how sensitive to light the camera’s sensor is. A higher number means that the sensor will be able to record an image in lower light, but will introduce more digital noise. A lower number indicates the sensor will need more light, but produce a cleaner image.
ISO is the modern equivalent of the term ASA that was used to designate ‘film speed’ and a film’s sensitivity to light.
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