6mm f/2.8 Fisheye-Nikkor on a Nikon D800 - First Time Ever? - YouTube
This Uber-Rare Nikon 6mm f2.8 Fisheye Lens Can See Behind Itself - The Phoblographer
Nikon Compendium - The Lenses
6mm f5.6 Fisheye-Nikkor Lens
Not for the frugal fisheye photographer: Rare Nikon 6mm f/2.8 Ai-S lens available on eBay for around $85k
Nikon Fisheye Nikkor 6mm f/2.8 Lens | modern design by moderndesign.org
Gear] Vintage Nikon Fisheye Lens on Sale for $160,000 | Fstoppers
DSC04841 edp | Testing Nikon 6 mm f/5.6 Fisheye-Nikkor on So… | Flickr
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
Lens pr0n: The Nikkor 6mm f/2.8 fisheye monster | TechCrunch