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Old 12-28-2017, 08:58 PM
BlueStreak's Avatar
BlueStreak BlueStreak is offline
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Join Date: Oct 2009
Location: The Swamp
Posts: 27,407
I make use of the concave form in my reflector telescopes, one Newtonian, the other Maksutov Cassegrain.

The concave form is a wonderful thing.
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