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Hi Roger
I have an SBIG ST7E. In terms of condensation, when I have seen it on my system, it starts off as a general mist over the entire frame when I first switch on the temperature cooling. Then as the cooling takes effect, it begins to clear radially from the centre, like a ring or doughnut gradually expanding as the central hole expands and the rim spread to the corners, before finally disappearing after say, 20 or 30 minutes.
Baking the desiccant plug in the oven has always fixed this in my case.
I have also had something similar to your image after cleaning the glass window with 99% pure iso propyl alcohol. After re-cleaning with distilled water, that effect disappeared.
Good luck!
Dennis
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