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Hi Peter,
You can start to eliminate things by removing or replacing bits.
To check if the the nose/filter of the QHY-8 camera is the cause, i recommend you remove the filter/nose and replace it with just a spacer of the same length (So you can focus). BUT, and i mean BUT, DO NOT CONNECT the TEC power cable. This way you wont fog up and wet the internals. With the TEC off, you can take the same image, and see if the reflections still there. If not, theres your problem, else, well, you need to see..
Theo
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