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Brian Liepe: ISO is a numerical scale that refers to the sensitivity of a camera's sensor to light. Now ISO is based on something called the exposure index, which rates film stocks using a numerical value. As you lower the ISO setting, the sensor becomes less sensitive to light. As you raise the ISO setting, it becomes more sensitive. Chad Perkins: Personally I get a little scared adjusting ISO anymore than just a few increments. When you increase the camera's sensor sensitivity to light by bumping up the ISO, it adds noise, which can be awful.
So in the next movie we'll look a little bit more about how ISO relates to noise and also to the colors of your image.
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