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I agree concerning the cooling and the system, but I am being conservative with the equipment for longevity. A QHY with an APS-C size sensor with a differential of 45C would be my preference - Sony low noise CCD - for widefield to get those sorts of temperatures.
I might be dead before then, but if they decided to put an APS-C Sony CCD in the open source QHY I would snap it up tomorrow.
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