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I am positive - cf is an insulator so it takes a lot longer to equalise temp
as it will keep the inside of the tube at what ever temp it was left at for longer. Steel tube will transfer the heat much quicker reaching equalibrium
faster which is also why it changes focus more quickly . You can have one or the other.
Its why you dont see big refractors in CF either they would never cool down the inside air would be insulated even more .
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