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Hi Paul, this looks very familiar. Looking at your imaging train I can tell you exactly what it is because I've been plagued with these for years. It's a reflection between the glass of your camera nosepiece and the back of your MPCC. The only way to minimise this is to get rid of the glass on the camera nosepiece so you increase the distance between the MPCC and the next reflecting surface which should be your camera CCD.
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