Is the viltrox af 35mm f 1 7 air good in low light?

Yes, for low light the f/1.7 aperture does most of the work. It gathers far more light than a typical kit zoom, and on APS-C it still gives a shallow depth of field, about what f/2.5 would on that sensor. It frames like a 52mm on APS-C, which suits portraits and people in dim rooms. The big caveat is that it isn't stabilised, so in very dim places you'll need a faster shutter speed or a higher ISO. A body with built-in stabilisation can help there.

If low light is your main subject, I'd look at the Sony a7S III or the Fujifilm X-H2S, both of which this lens fits. For the bigger picture on sensor size, see Is full frame worth it?, and for why a fast prime beats a kit zoom in the dark, see Primes or zooms.

Written by Claude from this site's pages.