You asked

Is the viltrox af 24mm f 1 8 good in low light?

Here is what the site says about that.

From Viltrox AF 24mm f/1.8: Viltrox AF 24mm f/1.8: A prime lens by Viltrox for Full frame cameras, 24mm f/1.8. Specs - Maker: Viltrox - Focal length: 24mm (prime) - Maximum aperture: f/1.8 - Made for: Full frame sensors - Mounts: Sony E, Nikon Z - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E, Nikon Z): as marked, 24mm. - On APS-C (Sony E, Nikon Z): like 36mm on full frame; f/1.8 ...

From Viltrox AF 25mm f/1.7 Air: Viltrox AF 25mm f/1.7 Air: A prime lens by Viltrox for APS-C cameras, 25mm f/1.7. A cheap, light standard prime for APS-C.

Quoted from this site's pages.

From these pages