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The latest ZWO cooled OSC cameras have a 5W polyimide anti dew heater around the protective window to eliminate condensation, dew etc.., at all sensor temperatures
I have the 2600MC and by default I leave the dew heater on as I have a dedicated 12V 7.5A power supply to the camera
QHY usually piggy back ZWO ( and visa versa )so if your camera is a current model then it’s possible it has an anti dew heater installed
Just check their website or your suppliers site
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