You asked
Nikon z 400mm f 2 8 tc vr s vs ttartisan 500mm f 6 3?
Both lenses reach far, but they suit different shooters. The Nikon Z 400mm f/2.8 TC VR S is the pro option. It has autofocus, stabilisation, a built-in 1.4x teleconverter, and a wide f/2.8 aperture for fast sports and wildlife. It fits Nikon Z bodies such as the Nikon Z9 and Nikon Z6 II. If you shoot action, this is the one I'd pick.
The TTArtisan 500mm f/6.3 is manual focus with no stabilisation, and f/6.3 gathers much less light. Its appeal is the mount range: it fits Sony E, Canon RF, Nikon Z and several other mounts, so you can get 500mm on a body you already own. Expect to work slowly, with a steady tripod.
For more on reach, see the wildlife and sport guide.
Written by Claude from this site's pages.