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And don't forget that something like a 12"+ telescope in a tube will feel even the slightest touch of breeze. Even a truss with a shroud creates this effect.
Truss wins hands down unless you can fully actively cool something like a carbon fibre tube.
The other issue is weight vs cost. I think this is the reason why there has been a big shift to truss tubes as well to keep the weight down and easier to break down and transport.
Obviously depends on the mount you get and I notice that some of the premium RC telescope makes still offer tube designs.
John K.
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