![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Angular_aperture.svg/640px-Angular_aperture.svg.png&w=640&q=50)
Angular aperture
From Wikipedia, the free encyclopedia
The angular aperture of a lens is the angular size of the lens aperture as seen from the focal point:
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Angular_aperture.svg/320px-Angular_aperture.svg.png)
where
is the focal length
is the diameter of the aperture.
The angular aperture of a lens is the angular size of the lens aperture as seen from the focal point:
where