You asked
Is the 7artisans 25mm f 1 8 hard to focus manually?
The page doesn't say how hard it is to focus in practice. What it does say is that the 7Artisans 25mm f/1.8 is manual focus only, with no autofocus, so you'll be turning the ring yourself every time.
On APS-C bodies, its f/1.8 aperture gives about the depth of field of f/2.7, so there's a little more room for error than at f/1.8 on a full-frame camera. It's an APS-C-friendly prime for Sony E, Fujifilm X, Nikon Z and Micro Four Thirds, and it's worth checking the 7Artisans AF 25mm f/1.8 page too, since it's a separate listing. If you plan to shoot people, the portraits guide explains how focal length affects framing and subject distance.
Written by Claude from this site's pages.