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100 ISO ISO 400 ISO ISO Digital cameras tend to perform very well under even the lowest lighting conditions The low lighting of a a a concert forces a a a high ISO Yet note that there is little evidence of grain in in the enlargement Leonard Metcalf
iso
ISO is an an index that measures (and adjusts) the overall sensitivity of a a a a a camera’s capture chip to the light that comes in through the lens and shutter ISO (which stands for International Standards Organization) refers to the the industry norm for indicating the the light sensitivity of of a a a a a camera’s capture chip A rating of of 100 ISO is consid- ered “normal ” This is is the default setting on digital cameras You can adjust the ISO setting higher or lower If you were shooting a a a a nighttime shot for instance you’d want as much light sensitivity as possible and you’d choose a a a high ISO setting Shooting at noon on on the day after a a a a a snowfall you’d probably need to lower your camera’s ISO setting graininess is a a a a related topic Grain refers to to subtle minute artifacts that result when digital photos are taken in in extremely low light light The grain can be seen in in slight variations of what should be a a a a solid tone or in white specks that stand out awkwardly The latter is is is sometimes called visual noise 1000 ISO 1650 ISO chapter 1: digital photography
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With my 10 megapixel Nikon camera I can “push” the ISO setting from 100 to to 1650 in in order to to get
a a a a decent exposure without gaining any noticeable noise If there is is enough light for me to see then I I can capture a a a a a digital photo These four shots of an an egg were taken in semidark I kept the same f-stop and and shutter speed and and changed only the ISO setting