A Hole In The Sky
Taken by Eliot Herman on October 4, 2018 @ Tucson AZ
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A curious atmospheric optics observation where the Moon in a light haze apparently cast the image of a dark hole in the sky. Note that the dark hole suppresses the stars shining through. Acquired during meteor imaging. The creation and dissipation of the hole is shown in a move assembled from the 15 sec imaging into a GIF.

See https://flic.kr/p/PzwKhf

Imaging captured with a Nikon D810 and 8 mm Sigma lens.
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I wonder if this is not a lens effect i.e. condensation on the lens, with that moonlight reflection on the dark spot`s edge. Did you also observe this visually?
Posted by pphv 2018-10-10 02:17:34
This will happen to any optics when the temperature and dewpoint meet or get very close. I hate it. Dew shields are your friend, but its impossible to shield a fisheye like this... Fans help, or electric heaters.
Posted by kb9uwu 2018-10-10 10:38:26
7 thumbs up
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