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Hi Dachs I built a 10 inch Newtonian using PVC piping. It is easy to work with but one of the problems is that the PVC tends to hold the heat for a while and acts like a type of insulator. The air inside the tube tends to differ from the ambient temperature. This tends to make the images not as good as they should be. By all means do it but you will eventually change the PVC. By the way go for the bigger tube to let a bit more air into it so that your air currents inside the tube settle down a bit quicker.
Regards Cristian
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