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Oh dear, you need to think long and hard about that, your heading for a hiding, do homework. Not my experience BTW. Someone I know fitted a large long FL tube in a small dome and it was a disaster, endend up trashing the dome and moving to a roll off. Thermals in this situation worsened seeing by 2 arcsecs, it was awefull, although they did have large day/night temp transitions. If you increase FL for planetary to say 6m and more (seems thats what planetary guys do), its going to be much worse, thermal management is going to be a serious problem.
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