There's a little remark at the bottom of the 60x column in the Telescope Performance table on page 6 in the amazing All About Telescopes book. It says one can go 60x/in magnification for a close double.
Elsewhere, the book says the top useful power is 60x and that no additional detail can be had, with extended objects, going beyond.
So, 60 times 8, with my SCT: 480x. Huh.
With the ETX? 210x.
Thursday, November 21, 2019
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