You asked

Is the nikon af s 85mm f 1 8g good in low light?

Yes, the Nikon AF-S 85mm f/1.8G is a good low-light lens. Its f/1.8 maximum aperture gathers far more light than any kit zoom, and that's what matters in dim rooms and evenings. Be aware it has no stabilisation, so you'll rely on the wide aperture and a fast shutter speed rather than lens shake correction.

It's at its best on full frame. The Nikon D750 and Nikon D850 are both full frame bodies that take it, and the Nikon D6 is the pick if you shoot in very poor light for a living. On APS-C it still works, but it frames like about 128mm and the low-light gain is smaller. For more on that trade-off, see sensor sizes. If you want a cheaper start in low light, your first lenses covers the 50mm f/1.8 option.

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