aperture - Hutchinson encyclopedia article about aperture Printer Friendly
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aperture

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aperture

In photography, an opening in the camera that allows light to pass through the lens to strike the film. Controlled by the iris diaphragm, it can be set mechanically or electronically at various diameters.

The aperture ratio or relative aperture, more commonly known as the f-number, is a number defined as the focal length of the lens divided by the effective diameter of the aperture. A smaller f-number implies a larger diameter lens and therefore more light available for high-speed photography, or for work in poorly illuminated areas. However, small f-numbers involve small depths of focus.



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? Mentioned in ? References in classic literature
 
In the trap-door itself was found a square aperture cut in the wood, apparently with some exceedingly sharp instrument, just behind the bolt which fastened the door on the inner side.
The Moonstone by Collins, Wilkie View in context
The little pink sloth-creature was still blinking at me when my Ape-man reappeared at the aperture of the nearest of these dens, and beckoned me in.
The Island of Doctor Moreau by Wells, H.G. View in context
he had said for the third time, to his comedians, speaking machines; then as he was marching with great strides in front of the marble table, a fancy seized him to go and appear in his turn at the aperture of the chapel, were it only for the pleasure of making a grimace at that ungrateful populace.
Notre-Dame de Paris by Hugo, Victor View in context
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