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Thanks all for this useful information. I was a bit wary of opening up the inner chamber so I will leave this and only dry the outer workings. Some much for the QHYCCD FAQ! Their suggestion would have left dry air only in the inner chamber.
Interesting about the slow cooling - I have not seen this mentioned in the (slim) instruction manual but I can easily follow this using my Nebulosity software.
I am quite happy otherwise with my QHY9 but have fond memories of my old QHY8, bought second hand but still did four years of service before it failed completely. Sure it had moisture problems but these were easily fixed.
Cheers Peter
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