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
Nikon Fisheye Nikkor 6mm f/2.8 Lens | modern design by moderndesign.org
Nikon AI-S Fisheye-NIKKOR 6mm F/2.8 | LENS-DB.COM
Rare Lens] $160,000 Nikkor 6mm 2.8 Fisheye Can See Behind You | Fstoppers
6mm f/2.8 Fisheye-Nikkor on a Nikon D800 - First Time Ever? - YouTube
6mm f5.6 Fisheye-Nikkor Lens
Grays of Westminster Through the Eyes of the 6mm f/2.8 Fisheye-Nikkor Lens | Grays of Westminster
Gear] Vintage Nikon Fisheye Lens on Sale for $160,000 | Fish eye lens, Lens, Nikon