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Hi Peter,
there is dry Argon gas inside the sealed chamber.
You can't remove it unless you have that special gas in a gas can to replenish it.
That's done with a plastic bag full of Argon with the camera inside it.
The QHY9 is not sealed inside for any of the other parts.
There is a gap between the connectors on the QHY9 case & the outside air.
I slowly cool mine to -30 degrees every time I use it.
By slowly I mean 5 to 10 minutes.
I first set the temperature to +5 degrees & then leave it for 1 minute ,
change it to -10 degrees then -15 then straight to -30 C.
When warming up I do it slowly as well in the same way.
You need to put the camera into manual to adjust the temperature
before connecting the 12 Volts for the peltier cooler.
If you leave it in auto at -30 it will jump all the way down & possibly crack the chip.
A sudden temperature shock can crack the KAF8300 chip.
I think there is a heater around the camera chip seal which should remove all the moisture from the glass cover.
I've never had any problems with dew or moisture buildup.
The QHY9 is a wonderful camera.
The only problem I ever had is that fast download of data
causes horizontal black lines from bright stars and 4 times the camera noise.
Always download the data using slow download.
cheers
Allan
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