You asked
Is the ttartisan 11mm f 2 8 fisheye good for landscape?
Yes, with a caveat. The TTArtisan 11mm f/2.8 Fisheye is manual focus only, and that suits landscape well. The scene hardly moves, so you can use a tripod and take your time. On full frame it frames as 11mm, and the fisheye curve will bend your horizon. That's great for big skies and strong foregrounds when you want the distortion, but it's not what you want for a straight record of a view.
The landscape guide also says you'll usually shoot between f/8 and f/11 for depth of field, so the f/2.8 speed is a bonus rather than a reason to buy it.
If you want a more natural wide view, a 16-35mm zoom is the classic choice. You can check which cameras the fisheye fits on its lens page.
Written by Claude from this site's pages.