What time-consuming disadvantage affects closed-tube systems like refractors and Catadioptrics when brought outside on a cool night after being indoors on a warm evening?
Answer
They must wait for the optics to reach thermal equilibrium with the outside air.
Closed-tube systems trap air that remains warmer than the surroundings, causing internal currents that degrade image sharpness until the entire mass of glass and metal has cooled sufficiently, which can require waiting an hour or more.
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