I've been staring at the Telescope Performance table on page 6 in the amazing All About Telescopes book. I'm very intrigued by the "light" column comparing telescopes to the human eye.
A 1" telescope can gather 9 times the light of a single eye. Or the "light power" of a 1" telescope is 9x that of the eye.
A 2" 'scope is 36 times.
A 3" is 81x and the 4" is 144x. The Meade ETX 90 is between those numbers.
An 8": 576x. That's the size of the Celestron 8-inch SCT.
Wednesday, November 20, 2019
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