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Strange Rings around the bright stars.

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John Stone avatar

I’ve been shooting my EdgeHD 8” at F10 through a new set of Chroma 3nm filters and I’m getting very strange bright stars on a Player One Ares-M (IMX533).

I’m seeing this kind of pattern in multiple filters.

Anyone know what this could be?

12 minutes — Chroma 3nm Ha:
📷 image.pngimage.png
12 minutes — Antlia 3nm Ha:
📷 image.png📷 image.pngimage.png
I’m stumped at what could be causing this artifact.

Chroma Sii 3nm - 4× 12-m stacked:
📷 image.pngimage.png

Well written Respectful Engaging
sharkmelley avatar

That’s the Airy pattern caused by centrally obstructed optics. John Hayes describes this as the difference between 2 similar diffraction patterns that lead to a “beat” effect:

https://app2.astrobin.com/forum/topic/188005/drizzle/is-this-what-i-think-it-is?page=1#post-204344

Well written Concise Engaging