You asked
What are the alternatives to the nikon z 85mm f 1 8 s?
The 85mm f/1.8 S is already a strong portrait lens, so the sensible alternatives depend on what you want to change. My Nikon Z 85mm f/1.2 S is the obvious sibling if you want a faster 85mm for more background blur.
If you want to spend less, the portraits guide recommends a 50mm f/1.8, which I call the cheapest great lens in photography. For more reach and tighter headshots, the same guide suggests a 135mm or a 70-200mm f/2.8.
I don't have a full list of other 85mm-class lenses for Nikon Z, so check the lens pages before you buy. For the basics on choosing a focal length, start with lenses.
Written by Claude from this site's pages.