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CF vs Aluminium tube. Agreed less weight but the cf tube has two large Losmandy style plates top and bottom. Would these not try to expand and contract re temperature variation?
I find with my 10" al tube that running the fans quickly brings the temp down for cooling whereas I suspect the cf tube would be at a higher temp for longer. Practically I find that if I refocus after 30-45 min of imaging then the focus stays put, it sometimes has a very small focus shift.
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