ISO is the sensitivity towards light. For example, at night time you would want to shoot with a higher ISO number so that the picture would have more light. When you have a higher ISO number, the picture tends to have more grain to it. When it is very bright out, you would want to use a lower ISO number so that the camera is not very sensitive to the light. When you have a high ISO number, you want to have a fast shutter speed to make sure that not too much light is coming in. When you have
a low ISO, you want to have a longer
shutter speed so that you have enough time to get light in.
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