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QHY are temperature regulated. Not to the same precision as SBIG (who have a patent on keeping the chamber temp to 1/100th of a degree or so) or FLI.
i've found it is a little tricky to estimate just what delta t you can get with a QHY, as the power required seems very nonlinear. But as the chips are thermally "quiet", a set point of -10 is more than adequate.
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