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Old 18-09-2019, 01:35 PM
Wavytone
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Wavytone is offline
 
Join Date: Jul 2008
Location: Killara, Sydney
Posts: 4,147
Hmm... If I was into grinding glass one of those singlet lenses could be a candidate to construct a 150mm Hamiltonian scope.

What stops me is that an ordinary f/8 newtonian is simpler to make and perfectly achromatic.
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