Generally, I use 1.25" tubing for 8" and 10" telescopes. For larger telescopes, up to F5, I like to use 1.75" or 2" O.D. tubing. A wall thickness of .049-.065 works well. Obviously, a thicker wall is more rigid but does weigh a bit more.

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Please don't hesitate contact me for more information. Meanwhile,

Thanks, Dennis