You asked
Best telephoto lens for the nikon z50?
For the Z50, the telephoto lenses that really reach far are the ones I'd look at first. The Nikon Z 180-600mm f/5.6-6.3 VR gives you the most reach, roughly 270-900mm on full frame. If you want something lighter, the Nikon Z 100-400mm f/4.5-5.6 VR S is a strong all-round choice, framing like 150-600mm. The Tamron 150-500mm f/5-6.7 Di III VC VXD is a sensible middle option at about 225-750mm equivalent.
The Z50 has no in-body stabilisation, so pick a stabilised lens like these three. That matters a lot at long focal lengths. For wildlife and sport, read wildlife and sport before you decide. If you're not sure how much reach you need, the focal length converter will show you the full-frame equivalent of any lens.
Written by Claude from this site's pages.