dmsummers wrote: @Alex, If you use a Pegasus PowerBox, or V2, or any other sensor that reports temperature via "WEATHER_TEMPERATURE", (i.e. if you see temperature reported in the dome tab), then you will likely be able to use the autofocus delta-T feature that florian mentions.

Hello, this is unfortunately not true. Only the focuser temperature will work. Not the observatory one. The weather temperature was added after my feature implementation, and was not made available to it.

I would also advise, like others, to start telescope cooling more in advance, so that it gets more stable sooner.

Clear skies.