Weird full circle moon from a sliver

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uhligfd Veteran Member • Posts: 3,106
Weird full circle moon from a sliver
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I took this shot around 2 weeks ago when the moon was very new, young, just a slim semi-circle sliver to the right. Taken at night, moon behind some light clouds. Two pictures show the same weird effect: in both the moon looks like a full disk, all around when I expected just a thin half circle as I saw it then and as it appears for new moons on their second night out.

Can anyone explain how the full moon disk came about, how (optical principle) it was created, optically.

The shot was a 15 sec shot at ISO 1600, probably with f stop around f/4 or f/3.5. I cannot remember the lens. It was either the Rok 12mm f/2 or the Rok 21mm, f/1.4.

Any ideas? I am baffled how this full disk came about from the lit half semicircle of reality ...

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