Synopsis:
Exposure is how much light is used in a photo and is controlled by aperture, shutter speed and ISO.
Shutter speed is how fast the curtain closes over the lens and is measured in fractions of a sec. Shutter speed controls how long light enters the lens and controls how motion is captured.
Aperture is controls the amount of focused light entering the lens. It can be adjusted to change the depth of field of what is in focus.
ISO is the specific light sensitivity in the photo. A lower ISO is less sensitive and has less noise in the image.
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