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Wow, that is a very different pattern to what frosting makes on the ASI294. When I needed to dry the dessicant out on mine it showed up as a blocky, crystalline pattern in the center of the image, most obviously on flats.
I found that it does tend to sublime away in the ASI294 so I just cool the camera to -15 well before I want to use it. I know that the 071 is more prone to frosting than most though, from what I had read it is down to the different sensor package of the IMX071 to most others making it more prone to frosting up, and it is an IMX071 issue rather than a ZWO issue, just QHY may have managed the chamber sealing better?
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