You asked
Is the nikon z 400mm f 2 8 tc vr s worth buying used?
Yes, I'd look at this one used. The Nikon Z 400mm f/2.8 TC VR S is a pro sports lens with a built-in 1.4x teleconverter, stabilisation and autofocus. Long lenses like this hold their value well and change hands a lot, so the savings can be large. The buying used guide explains why lenses hold value better than bodies.
It fits every full-frame Nikon Z body in the catalogue, so a Nikon Z9 or Nikon Z8 is a natural partner for serious sport and birds. If you shoot APS-C, the Nikon Z50 frames it like about 600mm on full frame, which is a good match for a lens this long.
If you're still deciding how much reach you need, the wildlife and sport page covers the cheaper options first.
Written by Claude from this site's pages.