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I use -10 on the qhy8pro as it can achieve this temp all year round so same calibration files can be used. I started off comparing stretched darks at -10,-15 and -20 and couldn't notice any difference so decided -10 would do. I think it is going to depend on the type of CCD the camera has as to how much benefit you are going to get by going colder. The QHY8 has the Sony ICX453 CCD whereas the QHY9 has the KAF8300.
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