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Does anyone know how to treat this artifact?

Remco HekkerRemco Hekker
in PixInsight
Hi Adam, and everyone else who is reading this.

This summer, I finally bought my first cooled Astro camera. The ASI533MC Pro. It's an OSC.
Yesterday, I was using the poor conditions to scout my new project, and when I took a test image of M45, I noticed this artifact that I'm painfully familiar with in daytime footage. It looks like a reflection from the Bayer-array onto a glass element inside the optical system.
Today I finally started to process some of the data I collected earlier on a different project, and I noticed the same element after  I integrated all my subs.

Does anybody have an idea of how to work on this artifact? In the colorgrading of video, there is no good way of dealing with this problem, but in Astro imaging, we spend so much more time and effort into one image that I hope there is a way to make it less obtrusive. Especially since I guess I will run into this problem everytime I have a bright star in my image. 

I can make (a selection of) the M13 data available if that would help.

Any advice will be greatly appreciated!

Comments

  • BlockHeadBlockHead
    This looks like microlens artifact. The ST10XME (SBIG) camera I used to use had this. 
    There really isn't a good way to fix this artifact.
    I could be wrong..but it really looks like microlens effects.
    (Please look that up and see if this is on point.)

    -the Blockhead
  • BlockHeadBlockHead
    I just learned the "Talbot" effect might also be involved.
    Apparently anti-reflection coatings can act like diffraction sources. 
    It is new to me... but just thought I would mention another thing.
    It doesn't help you solve the issue though... just adds another potential name for the effect.
    -the Blockhead
  • Remco HekkerRemco Hekker
    Hi Adam,
    Thank you for your response. I have found some interesting references to both the Talbot-effect and Microlens diffraction. Honestly, this stuff is somewhat above my pay grade. Although, now that I know in what direction to look, I have a friend who will help me understand these effects better. Perhaps not to fix them in postprocessing, but at least to better understand my camera's limitations. 

    Fortunately, the effect only showed up minimally in the end result of my M13. It is there if you know what to look for. But perhaps that's a sign that I've overprocessed my background. I'm still very much learning this stuff, so I guess I'll find out later.

    Again, Thank you for pointing me in the right direction.
    Remco
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