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An issue or not?
My SBIG ST-8XE develops window frost which lasts for approx. 30 minutes until it starts to clear away, totally clearing after about an hour to hour and a half. It is quite noticeable - see attached sub. The frost starts a bit higher than this, but my first subs are usually like this (after focusing etc it's started coming down). You can watch each sub having less and less visible frosting. (it is NOT vignette). This camera routinely gets to -20° C, and QUICKLY (which I am sure is a factor in the frosting).
Is this indicative of a sealing issue in the chamber, or does it need inert gas regassing? Dessicant plug need replacing or drying?
I thought I read somewhere too that these have a window heater - is this the case? I guess since it is clearing it DOES work, just slowly...
Opinions appreciated.
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