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Markus,
All I can contribute is, when the primary mirror starts to dew up it means it's time for bed. A hairdryer poked in the tube only gets you another 5 minutes before it dews up again, so I don't bother now I just shut it all down.
But everything that you described is correct.
Cheers
Bill
Edit: The dew heaters are not really hot enough to give thermal instability, only enough heat to just get over the dew point.
Last edited by billdan; 09-03-2016 at 11:35 PM.
Reason: More info
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