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Yep, been down this path. I typically get internal reflections when using the blue and green filters. As Don points out - to calculate the source of the reflections you can use a simple formula:
HD = Halo Diameter in pixels
P = Pixel size in microns
FR = Focal Ratio
(HD * P * FR) / 2 = a distance of X mm from the chip.
You'll need to know the mechanical measurements of your camera so you can work back from there. Internal reflections don't pose any problems and can easily be processed out.
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