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Carbon Fiber Tube
That which makes carbon fiber beneficial also makes it a detriment.
It will prevent (in the same way an insulator would) the mirrors in the scope from cooling down.
Comparing a carbon-tubed C-11 with and aluminum one, the aluminum one lost the thermal problems with the star images after 3 hours. The carbon-tubed version still displayed thermal image issues at dawn (!).
So I think it matters whether the instrument will be used visually or photographically (aluminum being preferable for visual use).
But, if active cooling is used on the cassegrain, then the tube material isn't really an issue.
Don
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