Thread: GSO 10" RC -- truss or tube?
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Old 27-03-2017, 10:04 AM
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gregbradley
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Join Date: Feb 2006
Location: Sydney
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Thermal tube currents make closed tubes for long focal length scopes very non optimum. I had a closed tube 12.5 inch RCOS and could not get super sharp images out of it.

Greg.
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