what is the weird artifact in the bright star

Started 5 months ago | Questions thread
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JaXImagea Forum Member • Posts: 89
what is the weird artifact in the bright star
1

Can anyone  tell me (or fathom a guess) what the strange shape in the bright star on  the left is caused by. (Alph mod D800, 43 90s lights, dark flats, bias and flats. Shot with Nikon 500mm Pf, ISO 1600, stacked and stretched in APP).

Final result

 JaXImagea's gear list:JaXImagea's gear list
Olympus Tough TG-4 Nikon D50 Nikon D810 Nikon D850 Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II +11 more
ANSWER:
Nikon 500mm F5.6E PF Nikon D800
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