What Is Your Camera’s ISO Setting?
In photography, ISO is a measure of how sensitive a piece of film or digital sensor is to light—the higher the ISO the more sensitive. With a low ISO you need to use a longer shutter speed or a wider aperture than you would if you’re using a high ISO. Most digital cameras have an ISO range of between around 100 and about 12,800.
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via: howtogeek.com
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