Good R lens for astro work

[Aram Langhans]

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I am looking for a manual lens with an infinity stop to adapt to my Nikon Z7 for astrophotography.  I have some R glass, but the 35 cron is not wide enough and the 24/2.8 is soft in the corners.  I was wondering if anybody has used the 28/2.8 for astrophotography and if coma and sharpness is controlled well enough for stars to show as nice points in the corners.

Or perhaps i need to look to M glass for a 28mm that would perform better than my Nikon 28/1.8 F lens.

[hepcat]

Searching here there's a number of threads on the subject.  Here's one.

https://www.l-camera-forum.com/topic/332072-lenses-for-astrophotography/

[Camaro5]

First question is how would you know if a lens is soft in the corners if you're shooting night skies?  I have a 24/2.8 and have used it at night although not for astro work.  I've noticed a little bit of vignetting wide open, but it's very slight, and it can be corrected in post or by stopping down a little.  This lens at f/2.8 is fine in low light, but not fast enough for astro.  

I use a Sigma 20mm/1.4 DG DN Art lens for the night sky work I do on an SL2-S.  No infinity stop but with a Bahtinov mask and magnification you really don't need one.  

[Guest]

Two nights ago I shot the full moon with my APO-Telyt-T 180 f/4. Film goes to development next week, so if it worked I can show the pic week after next.