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Strange shadow on some dark frames

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#1 GR-Amateur

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Posted 24 October 2020 - 02:19 PM

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.

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#2 SeymoreStars

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Posted 24 October 2020 - 02:28 PM

Light can enter via the view finder on DSLR's.



#3 GR-Amateur

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Posted 24 October 2020 - 02:31 PM

Viewfinder is covered with a Nikon cap destined for this job.
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