Aperture- determines the size of the hole that allows the amount of light to get through. The larger the hole, the more the light. Measured in f-stops. If the aperture is small, the Depth Of Field is large.
Shutter Speed- this is the length of time that the camera allows light to go through. Slow speeds allow more light and are used for low-light/ night photography to let more light in. Faster speeds help freeze motion
ISO- level of sensitivity of the camera to the light. Measured in numbers, the lower the number represents lower sensitivity to available light, higher numbers mean its more sensitive
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