Angular_aperture Angular_aperture

Angular aperture - Definition
Related Words: Aisle, Alley, Ambulatory, Arcade, Artery, Avenue, Bore, Breach, Break, Broaching, Channel, Check, Chink, Clearing, Cleft, Cloister, Colonnade, Communication, Connection, Corridor, Crack, Cut

The angular aperture of a lens is the appearant angle of the lens aperture as seen from the focal point:

<math>a = 2 \arctan \frac {A} {2 f}<math>

where <math>f<math> is the focal length, and <math>A<math> is the diameter of the aperture.

See also: f-number, numerical aperture

Example Usage of aperture
JThawley: Are you renaming files on import? RT @joshtheoak: aperture properly hides dupes roughly 0% of the time?
nkstrand: @logiclust aperture!
ryanapeterson: RT @ubermind: Looking for a great holiday gift??? Check out our amazing #aperture #iphoto plug-ins!!! http://ubermind.com/products/
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