You asked
Ttartisan 11mm f 2 8 fisheye vs 7artisans 10mm f 2 8 fisheye?
Both are manual-focus, full-frame fisheyes with an f/2.8 maximum aperture, so the choice comes down to field of view and mount.
The 7Artisans 10mm f/2.8 Fisheye gives you the wider view on full frame. It fits Sony E, Nikon Z, Canon RF and L-Mount. The TTArtisan 11mm f/2.8 Fisheye is a little tighter, but it covers more mounts, including Leica M, Canon EF and Nikon F. If you shoot an older DSLR or a Leica rangefinder, that's the one that fits.
On APS-C, the 7Artisans behaves like 15mm on Sony, Nikon and L-Mount, and the TTArtisan like 16mm. On Canon APS-C it's 16mm against 18mm.
There's also a 7Artisans 10mm f/2.8 Fisheye II page, but it doesn't list specs, so I can't compare it properly yet.
Written by Claude from this site's pages.