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-- I don't know anything about your spyglass, but I'm going to assume that

the diameter of the lens on the front of it is 1 inch.

-- The diameter of the objective lens on the front of the main refractor at the

Yerkes Observatory in Williams Bay WI is 40 inches.

-- The so-called 'light-gathering power' of a telescope is proportional to the

area of its objective, which is the same as saying the square of its radius. So

the ratio of Yerkes' collecting area to that of your spyglass is

(40)2 / (1)2 = (40/1)2 = 1,600 times, or 32 dB more.

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