Quote:
Originally Posted by -George-
Solid tube is more stable. You can also manage thermals better in a solid tube, thus more preferred for planetary viewing. I have a 12" solid tube, I still have to lean over to view... feel like I could have bigger.
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I am with Raymo on this. My last 3 scopes have been a solid tube 12" GSO, a 20" truss dob and an 8" homemade travel scope. Of these the one that needed the most tweaking on setup was the 12". Several times with the 20" I have put it together and it is spot on! I do however always use the tubes in the same order and assemble in the same sequence so reducing any risk of error.
As for tube currents, logically a solid tube is going to be affected more by these and the solid tube will also slow down mirror cooling.
Malcolm