To reach the sensor in the camera, the light has to travel through a hole. The same thing is true for telescopes. This is called the aperture in any optical system. It is known as f/stops and is normally written as numbers as an example,  1.4, 2, 2.8, 4, 5.6, 8, 11, and 16.  

Scroll to Top

Can’t get enough?

We are pretty sure our newsletter is worth your attention.