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What is ISO

The aperture and shutter let light in (and you can change the aperture size or the shutter duration to control how much light you want in), but when the light ultimately reaches the sensor, the sensor decides how much of this light it wants to soak in. Kinda like how darker colors absorb more heat than lighter colors--given the same temperature, a black car would get warmer than a white car. In the camera, we call this ISO. When you increase the ISO, the sensor becomes more sensitive to light, and your photo turns out brighter. So, ISO gives you a third way to control the brightness of your image.At this point, you may be wondering why we need three ways to control the brightness. Don't worry--we're going to get to that in a bit.