While I was checking a photo I took a few months ago, I noticed this strange pattern in this star... Is this caused by some kind of aberration? It does not worry me at all, just for curiosity
Equipment: Radian AP 61/275 Raptor OTA + ZWO ASI 533 MC PRO + UV/IR Filter
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Nothing to worry about, something quite small protuding in the light path, in or before the entrance pupil.
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I suggest you read this: http://interferometrie.blogspot.com/2014/08/esprit-tuning-how-we-finetune-esprit80.html
Basically, depending on the exact design of the lense assembly, there are typically small obstructions at the edge of the assembly that can cause such patterns. For example, individual lenses can be separated by rubber bands, wrapped into a ring. If these do not snuggly meet at the ends, you get the sort of issue you see.
It's fairly normal - although less common with more high end instruments.
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Marc:
I suggest you read this: http://interferometrie.blogspot.com/2014/08/esprit-tuning-how-we-finetune-esprit80.html
Basically, depending on the exact design of the lense assembly, there are typically small obstructions at the edge of the assembly that can cause such patterns. For example, individual lenses can be separated by rubber bands, wrapped into a ring. If these do not snuggly meet at the ends, you get the sort of issue you see.
It's fairly normal - although less common with more high end instruments.
*** Thank you! I will check it out ***
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