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Old 07-12-2018, 08:54 AM
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Astrofriend (Lars)
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Join Date: Aug 2017
Location: Stockholm, Sweden
Posts: 221
Hi,
I don't think it is this, but looks like that, Newton Rings:
https://en.wikipedia.org/wiki/Newton%27s_rings

Could come from two glass surfaces that are very close to each other.

Just an idea.

/Lars
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