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Same as mine.
I have a QHY8 and have this same problem on bright stars. I am using an LX200 F10 with a focal reducer in the image train. I am going to remove the IR filter at the front of the QHY camera. The CCD will still be in a closed cell between the CCD and the focal reducer. I will connect them up on a dry day or add a little warm air when doing so. this will I hope remove moisture that may ice up when the CCD cools down. I am really looking for a solution to this problem also. I think it's reflection on the IR glass of the QHY8 that is out of focus casing the donut.
Mardy
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