There is some definite coma, but it isn't bad and is gone by f/2.8. That shot is where it was most prevalent out of those that I took. I think because there were some brighter stars in the corners. A few other shots, even at f/1.8, it was much less noticeable, but dimmer stars.
Quick example:
Overall image:
Top left corner:
Sigma 14 mm f/1.8, 30 sec, f/1.8, ISO 400
I look forward it to it! Granted, I had a moonlit night, but I was pretty impressed with how much light the Sigma gave me. The minimal of vignetting was very impressive and useful.





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