Thread: The Ultimate Astronomy f ratio? State your case.
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Old 30-05-2023, 05:55 PM
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The Mekon (John Briggs)
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Join Date: Jul 2007
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F7 is the lucky number.
I have seen a couple of superb old Newtonians working at this ratio,
And it is the perfect number for modern APO's (I have one!)
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