Greetings,

I'm looking for some feedback and insights on the following picture:
https://astrob.in/9jfk6v/0/

The lens it was taken with is a 80-400mm Sigma on a Canon 5D MKII (unmodified) on a Star Adventurer tracker (unguided), stacked in Deep Sky Stacker and final edits in Affinity Photo.
My problem: There's slight fungal growth on the lens inside.
Now during using it during regular photography isn't an issue, but I'm still afraid that the "aura" around Arcturus could be caused by the lens defect. Especially  since the aura is not even, but fuzzy / hairy if that makes sense.

Any input on this topic is highly appreciated, if you have any tips to improve post processing I'm eager to learn since I'm still in the process of finding my workflow.

Thanks,
Martin
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