You asked
Nikon z 135mm f 1 8 s plena vs viltrox af 135mm f 1 8 lab?
On paper these two are almost identical. Both are 135mm f/1.8 primes for full frame, both autofocus, and neither is stabilised. The site doesn't list price, weight, or optical differences, so I can't tell you which one is better built or sharper. Check those before you buy.
The real difference is mounts. The Nikon is Nikon Z only, while the Viltrox also fits Sony E. If you shoot Nikon Z, both work the same way for you. If you might switch to Sony later, the Viltrox keeps that option open.
For a Nikon Z body, the Nikon Z6 II or Nikon Z8 are good matches for this focal length. For a Sony body, the Sony a7 IV is a solid partner.
A 135mm lens is a strong choice for tight headshots and background blur. Because the Viltrox is a third-party lens, make sure your body supports its autofocus; the lenses guide explains what to check.
Written by Claude from this site's pages.