I just had a realisation: out of all the mirrorless mount, Canon RF, Canon EFhM, Nikon Z, Nikon 1, L Mount, Fujifilm X, Samsung NX, Samsung NX Mini, Micro Four Thirds, Pentax Q, there are are literally only 3 native Fisheye lenses with Autofocus:
*Samsung NX 10mm f 3.5
*Panasonic Lumix G 8mm f 3.5
*Olympus M.Zuiko Digital ED 8mm f 1.7 PRO
Isn't that strange? That after this many years no other manufacturer has bothered to make a autofocus fisheye lens, some of the mounts are getting quite old now since their original launch date. I am not counting adapting the DSLR lenses here.
I know it's a very niche product but when I think of Nikon and Canon specifically they made an even more unique fisheye lens: Fisheye Zoom .... Even Pentax has a Fisheye Zoom though for APS-C.
Sigma made many fisheye variants as well, diagonal, full 180° AND circular fisheyes.
Sony just ported their fisheye prime from the old Minolta 16mm f 2.8
Maybe it's the photography industry's uncertainty of its future that keeps the big brands from making such niche products that they are not willing to invest money.
I have been thinking a lot about fisheye lenses as I keep enjoying my Oly 8mm f 1.8 PRO and keep remembering that for mirrorless, right now, this is the best it's going to get: absolute tiny on a dead mount (NX 10mm f 3.5 Fisheye Pancake), average lens (G 8mm f 3.5 Fisheye) or the best and the largest (PRO 8mm f 1.8 Fisheye).