Lensfinder.com - Ultra Rare Nikkor 6mm f/5.6. Only a few hundred of these lenses exist. This lens has a 220 degree field of view for Full Frame 24x36mm sensors. Made in Japan
1: Nikkor 6mm fish-eye lens mounted on a Nikon F3 body (photos by Jarle... | Download Scientific Diagram
Preposterously large and rare Nikon 6mm f/2.8 lens for sale in London - The Verge
Nikon's 6mm f/2.8 Fisheye on a Z 9 - first time ever? - YouTube
Huge 11-Pound Nikon 6mm ƒ2.8 Fisheye Lens Goes On Sale | Fish eye lens, Digital camera photography, Digital camera tips