Angular Aperture

The angular aperture of a Lens is the apparent Angle of the lens Aperture as seen from the Focal Point :

:

a = 2 \arctan rac {A} {2 f}

where
:

f

is the Focal Length
:

A

is the diameter of the aperture.

The angular aperture is approximately equal to twice the Numerical Aperture of the lens.

SEE ALSO

	CATEGORIES ABOUT ANGULAR APERTURE

	optics

	angle

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