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Certainly the current heater solution on the QHY9 is great. I ran my camera without the outer window for the first 6 months while sourcing suitable adaptors for the filter wheel and imaging train (tight on the Newt so every mm counts), and only once or twice suffered any minor frosting even during nights with heavy dewfall. Currently doing the Peter 4059 and Gama "thing" and running with argon inside the camera shell. Hoping will save infrequent need to slight dust or frost marks from outside edges once or twice a year.
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