You asked
Is the ttartisan 11mm f 2 8 fisheye hard to focus manually?
The site doesn't rate how hard this lens is to focus by hand, but you should know going in that the TTArtisan 11mm f/2.8 Fisheye is manual focus only, with no autofocus on any camera it fits. Every shot depends on your own focusing.
A wide lens like this is more forgiving than a long telephoto, since a lot of the frame stays sharp at a given distance. If you want to stop fiddling with the focus ring, try zone focusing. Set a fixed distance, stop down, and let everything in a band around it stay sharp. The Street page explains the method in detail.
Written by Claude from this site's pages.