You asked
What are the alternatives to the 7artisans af 10mm f 2 8?
If you want a 10mm lens with autofocus, the closest match is the 7Artisans AF 10mm f/2.5. It's a full-frame lens, so it's a different choice from the f/2.8, which is made for APS-C. Its wider f/2.5 aperture also lets in a little more light.
If you want something with a more distorted look, try the 7Artisans 10mm f/2.8 Fisheye. It's also made for full-frame cameras, and its fisheye view is very different from a standard 10mm.
Both are full-frame lenses, so check each page's mount list before you buy. If you're on APS-C, the f/2.8 AF is still the one that fits. For how aperture and crop factor change depth of field, see the focal length converter.
Written by Claude from this site's pages.