Pocket : What Is Aperture in Photography?: "Aperture refers to an adjustable opening in your camera lens that is able to limit the amount of light passing through the lens and hitting the camera sensor. Just think of it like your eyes. When you open your eyes, light enters through your cornea, and is bent through the pupil, which is a round opening in the center of the iris. The iris and pupil works exactly like the aperture of a camera, controlling the amount of light being emitted."
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