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Id agree with previous comments about it being a reflection of a circular aperture within the image train. Take your camera off and look through the image train from where the camera would have been, while having the scope look into a dimly lit light source.
if you see light reflecting off surfaces, paint them flat black. I recently had this very issue... I did as I said above and it is now gone. In my case it was reflecting off of a black anodised adapter. So even black anodised adapters will cause this issue.
Josh
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