Took totally 20x180sec darks at the end of the session and while from 1-15 subs looked like usual dark frames, subs 16 to 19 had an overwhelming green shadow while sub no.20 turned back to normal again. Nothing changed during the session, no extra light casted on scope, didn’t even moved from my chair. (Modded D5300 lps d2 clip in filter). Any thoughts or comments will be highly appreciated.
Strange shadow on some dark frames
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