You asked
Is the nikon z dx 24mm f 1 7 good for video?
It can shoot video well enough, but I wouldn't call it a vlogging lens. On an APS-C Nikon Z body it frames like a 36mm lens on full frame. That's tighter than the wide view I'd want for talking to the camera at arm's length. It also isn't stabilised, so you'll need the body's stabilisation, a gimbal, or a tripod.
The f/1.7 aperture gives a shallow, pleasing look, which suits interviews, b-roll, and shots where you have some distance from your subject.
If you want to use it for video, the native pairings are the Nikon Z50 and the Nikon Z30. For talking-head or vlogging work, read the vlogging notes first, and plan your sound using the audio section. Bad audio will hurt your videos more than a tight frame will.
Written by Claude from this site's pages.