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I have to disagree with George. The blanket statement that a solid tube
is more stable does not always apply. My 10" Flex Dob is rock solid, and
requires no more frequent attention[including collimation] than my old 10" solid tube did. As for tube currents, my FD primary mirror
equalises quicker, and tube currents are comparable with the solid tube
scope. In case anyone is wondering why I would swap one 10" for
another; the old mirror needs recoating, and the FD fits into my hatchback more easily, and because I am getting on in years, anything
larger is just too heavy.
raymo
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