You asked
Is the laowa 15mm f 2 zero d hard to focus manually?
The Laowa 15mm f/2 Zero-D is manual focus only, with no autofocus, so you'll be turning the focus ring yourself on every shot. The site doesn't go into how easy or hard that is in practice, so I can't give you a verdict on focusing feel. What I can say is that it's a fast ultra-wide made for astro, and the lens was built for manual use from the start.
You can check the Laowa 15mm f/2 Zero-D page for the full list of mounts and cameras it fits. If you're comfortable with manual lenses in general, the Lenses page has more on how they work on mirrorless bodies.
Written by Claude from this site's pages.