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Thanks Paul, I am just trying to get this nailed. The reflection seems to be present on really bright stars. I suspect it is the distance between the filter wheel and the sensor is at fault. The narrow gap could be producing just enough reflections of the secondary in the image. I could be wrong but that is my guess.
The QSI is a nice camera. I plan on doing some wide field work with it soon and I am sure it will produce much better results than I have now.
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