Thread: Eyepiece Selection: 20mm or 22mm Nagler?
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Old 18-06-2007, 08:48 PM
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AstroJunk (Jonathan)
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Quote:
Originally Posted by ausastronomer View Post
I am 48 yrs old and mine is about 6.2 mm
Which amazingly fits the formula: 8.1 - (age/25) !

I don't know where the formula cames from; I was given it and it seems to be ok.
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