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Aperture
ap-er-cher
noun
In photography, an aperture is the opening of a lens used to control the amount of light necessary to expose the sensor/film; in addition, the aperture is used creatively to control the compositional use of depth of field. A smaller (closed) aperture restricts light and increases the depth of field in a scene, whereas a larger (open) aperture allows for more light and decreases the depth of field within a scene.
The subject of Aperture is part of our Photography Basics Guide. Click here to view the article