According to Sony Addict, 7Artisans will be releasing an RF 10mm f/2.8 fisheye for full-frame. They will also be launching three new APS-C lenses for various crop sensor mounts.
7Artisans RF 10mm f/2.8 Fisheye Specifications:
| Focal Length | 10mm |
| Maximum Aperture | f/2.8 |
| Minimum Aperture | f/22 |
| Lens Construction | 8 groups, 11 elements |
| Minimum Focusing Distance | 0.17m |
| Sensor Type | Full-Frame |
| Aperture Ring | De-Clicked Aperture Ring |
| Lens Anti-Shake | No IS |
| Aperture Blades | 8 Blades |
| Angle of View | 178° |
| Lens Material | Metal |
| Weight | 570g |
| Focusing Method | Manual Focus |
| Mount | RF E Z L |
I have updated the third party RF list to include this upcoming lens, you can see all of the third party lenses available for the RF mount here.
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It still won’t get you the coverage of the Nikon 7.5mm or it’s replacement the Nikon 8mm full frame circular fisheye. Or close to the ultimate fisheye so far for FF cameras, the Nikon 6.5mm with a 220º field of view, yep, it can see behind itself! It was originally developed for atmospheric observations.
I'm curios.
Also, take that attitude to the extreme, and you can tell people to shoot everything with a fisheye, change projection to rectilinear with software, and crop. Voila, cheap replacement to the 800mm f/5.6.
An EF 8-15mm f/4L and adapter combo would get one there.
There's a Nikon F to Canon RF adapter that would allow mounting the Nikon 6.5mm on RF cameras. I'm not sure how many photographers have the deep pockets to buy it, and a real usage scenario for it, e.g. VR.