You asked
Tokina f rin 20mm f 2 fe af vs viltrox af 20mm f 2 8 air?
Both are 20mm autofocus primes for full-frame cameras, and neither has stabilisation. The choice comes down to brightness and mount.
The Tokina FíRIN 20mm f/2 FE AF is the one I'd pick for low light and for more background blur. It's a stop brighter than the Viltrox, and it only comes in Sony E.
The Viltrox AF 20mm f/2.8 Air is the sensible pick if you shoot Nikon Z or L-Mount as well as Sony E, since it covers all three. It's the more flexible of the two.
If you go third-party, check that your body supports the autofocus features you need, and that the maker allows that mount. See third-party lenses for more on that.
Written by Claude from this site's pages.