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Thanks Rowland, I am getting an idea about where this might originate from. The ASI1600 camera uses an external heater mounted to the front of the camera to prevent condensation on the sensor compartment window. I recall your effort to build something similar for your cooled DSLR. This ZWO heater element is an add-on to these original Version 1 cameras, subsequent later versions use a different approach. The heater element on the version 1 cameras, is sandwiched between the camera and the filter wheel housing, it maybe that the thin film element has shorted to the filter wheel case. I will start there.
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