You asked
Is the nikon z 70 180mm f 2 8 good on aps c?
It works well on APS-C, and it's a sensible choice if you want telephoto reach. On an APS-C body it frames like 105-270mm on full frame, and f/2.8 gives about the depth of field of f/4.2, so the background blur is a bit less than the lens's speed suggests. The focal length converter explains the maths.
It's a big, heavy lens for a small body, so I'd pair it with a grip. It isn't stabilised, so keep shutter speeds up. These APS-C Nikon Z bodies all take it:
For portraits, it's a good outdoor headshot lens, as I explain on the portraits page. For full details, see the lens page.
Written by Claude from this site's pages.