Sigma 50mm f 2 dg contemporary vs viltrox af 50mm f 2 air?

They cover the same ground. Both are 50mm f/2 autofocus primes for full frame, neither has stabilisation, and both frame like 75mm on APS-C. The difference is mounts. The Sigma 50mm f/2 DG Contemporary fits Sony E and L-Mount. The Viltrox AF 50mm f/2 Air also fits Nikon Z, so if you shoot Nikon Z, it's the only one of the two you can use.

On Sony E or L-Mount, I'd choose on price and what's in stock, since the site's specs don't separate them. Either way, check that your body supports third-party autofocus, as explained on the lenses page. For a first prime, your first lenses explains why a 50mm f/2 is a good place to start.

Written by Claude from this site's pages.