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aperture

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

aperture In photography, a hole that allows light to pass through the lens onto the film. Modern cameras usually have a diaphragm aperture which works like the iris of a human eye. The photographer can widen or narrow the diaphragm according to a series of points on the lens dial called ‘f-numbers’ or ‘f-stops’. The individual f-numbers represent the focal length of the lens divided by the diameter of the aperture. As the aperture narrows, it gives a longer depth of field.

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