How to calculate the amount of light a telescope collects?

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JoAstro
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Having the unaided eye's pupil to be 6.4mm and the diameter of a telescope 8-inches, how can I calculate the amount of light the a scope collects over the human eye?
 
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Calculate the area of each aperture. It's just the area of a circle. Then compare the area of the eye's pupil to the area of the telescope's aperture.
 

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