Thanks Glen.
Will try adding extra desiccant with the external tube and not worry about the gas. If that doesn't help then I'll look at the seals.
Was hoping I could use nitrogen as I have it - but it's not heavy like argon. But take your point about blowing Crap into the camera.
The asi071 has a built in window heater. So I haven't had any problems with few on the external window, just on the sensor.
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