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Digital Camera Glossary - Aperture

By Michael Carr, About.com

Definition: The size of the lens opening, which regulates how much light passes through the lens to hit the CCD. Aperture is measured in f-stops. A higher number equals a smaller amount of light. Some digital cameras (such as digital SLR cameras) allow a user to manually adjust the aperture setting.
Examples: Since I was using a fast shutter speed, I used a larger aperture to get sufficient light.

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