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I ran the camera at -10C for about an hour last night and it wouldn't shift - dropping it to -18C (the lowest it would go) didn't shift it but bringing the temp back up to around -1C did. It took a while though.
I also had an email from Michael at SBIG overnight who suggested I check where the problem appeared to be - inside or outside the chamber window. He also said that they are looking at a hardware fix - I suspect the chamber window heater is struggling.
I did try and drop it slowly as Chris suggested - no joy there.
I hope that if it continues, SBIG do come up with a fix.
Its odd that I only struck this issue this week - we've had a few warmer (and more humid) nights earlier in the year without any problems.
Will keep an eye on it over the next few nights - it should come right in time for the fuller moon and cloudy weather forecast for Sydney at the weekend
Pete
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