How does the light gathering power of a 220 inch telescope compare to that of a 15

  • Thread starter Thread starter Jesse M
  • Start date Start date
The light gathering power is just a ratio of the apertures.

A1 / A2 = pi R1^2 / pi R2^2 = R1^2 / R2^2 = 12100 / 56.25 = 215.1
 
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