We determine how powerful a telescope is mostly by resolution and the light gathering power. So, what is light gathering power?
Left is a Celestron CGE-800 which has a light gathering power of 843.
The light gathering power of a telescope is the theoretical ability of a telescope to collect light compared to your fully dilated eye. It takes both aperture and your fully dilated eye into factors. The larger the aperture, the higher the light grasp. It is directly proportional to the square of the aperture. To calculate this, first, you have to divide the diameter of aperture (in mm) by the diameter of fully dilated eye (7mm for a normal young man) and then square the result. For instance, an 8″ telescope has a light gathering power of 843 [(203.2/7)² = 843].
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