To speed up the thermal stabilization of an optical system from or from a closed carriage with a medium, once the site of observation is convenient to open around the telescope, and wait to pass ambient air where possible with attention to dust, humidity, etc..
a Newtonian telescope is favored by the open tube that allows air circulation, but for thermal stabilization of the parabolic mirror can be convenient to install an electric fan-type by computer. This will start the close time before starting the observations.
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