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Angular aperture
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
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