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I think if you well design a camera you may not need a sensor window heater. I am not sure if QSI, FLI and the others have window heater. As much as QHY and ZWO look interesting, I feel that their 1600-based were a kind of pioneers introducing CMOS cameras for deep space imaging to amateurs, and perhaps their next generation CMOS cameras will be more refined. Speaking of catching up, SX should be soon announcing their KAF 16200 and KAF 16803 based cameras.
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