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How to calculate the amount of light a telescope collects?

  1. Jan 17, 2016 #1
    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?
  2. jcsd
  3. Jan 17, 2016 #2


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    Staff: Mentor

    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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