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I had the exact same reflection with my QHY8, I got it when imaging with a a 2 different refractors, my C11, and a newtonian, all with and without flatteners/reducers etc.
I did the same thing that Doug did, removed the standard QHY8 nose piece, put a 2" to T-Thread adapter on it, and a 2" Baader U filter... Instantly cured the problem.
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