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Kuz, your Horse Head pic is very telling. I suspect it is internal reflection. Reason being the distortion is repeated with all bright stars across the field, and the pics being taken on different nights the dew and moisture levels would all have been different, but the distortion is consistent.
Any of your adapters have any shiny surfaces? Any black paint on surfaces that's been damaged exposing bright metal?
I can't see how over exposure could be responsible for such a distinct shape of distortion. The disortion is very uniform across the field. I could be wrong.
Alex.
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