You asked
Is the viltrox af 16mm f 1 8 good in low light?
Yes, for low light the f/1.8 aperture does most of the work. It's a fast prime, and as I explain on the lenses page, fast primes gather far more light than kit zooms. The catch is that this lens isn't stabilised, so in dim rooms you'll want a steady hand or a faster shutter speed.
It's also a full frame lens, and full frame is the sensor size I'd pick for low light. The sensor guide covers the trade-offs. Good bodies to pair it with:
Written by Claude from this site's pages.