Encyclopedia > Angular aperture

Article Content

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.

Featured Article

Islandia, New York

... are Hispanic or Latino of any race. There are 1,007 households out of which 35.3% have children under the age of 18 living with them, 59.8% are married couples livin ...