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Definition: The aperture is the size of the adjustable opening inside the lens, which determines how much light passes through the lens to strike the image sensor. A digital camera's aperture is measured in f-stops, and higher f-stops signify a smaller amount of light. The aperture changes, depending on the camera's settings for a particular shot.

Beginner-level digital cameras usually control aperture automatically. With more advanced digital cameras, a photographer might be able to control the aperture setting manually or allow the camera to set it automatically.

Common Misspellings: apeture, apature

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