You asked
Best wide angle lens for the nikon d850?
For the D850, my pick is the Nikon AF-S 14-24mm f/2.8G ED. It's a bright ultra-wide zoom, and its constant f/2.8 keeps the exposure steady across the range, which helps with night skies and dim interiors. The Sigma 14-24mm f/2.8 DG HSM Art covers the same range if you prefer it.
If you want something more everyday, the Nikon AF-S 16-35mm f/4G ED VR is a sensible choice. The D850 has no stabilisation in the body, so the VR helps at slow shutter speeds.
For a fast prime, try the Sigma 20mm f/1.4 DG HSM Art for more light and more background separation. If you're new to aperture, my lens guide explains why the f-number matters.
Written by Claude from this site's pages.