Thread: ISO
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Old Jun 8, 2004, 9:49 AM   #6
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Basically, digicams have an ISO rating indicating their level of sensitivity to light. When increasing the ISO the output of the sensor is amplified, so less light is needed. But that also amplifies the undesired noise which creates grainier pictures, just like in film photography but for different reasons. It'ss like turning up the volume on a radio with poor reception. Doing so not only amplifies the desired signal, but also the undesired static or "noise" as well.
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