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
Nikkor 6mm f/2.8 Fisheye Nikkor lens
Nikon AI Fisheye-NIKKOR 6mm F/2.8 | LENS-DB.COM
Nikkor 6mm f/2.8 fisheye lens video and photo samples - Nikon Rumors
Nikkor 6mm 2.8 Ai
Unboxing of my Nikon Nikkor 6mm f/2.8 Ai Fisheye Lens - YouTube
The remarkable Nikkor 6mm f/2.8 Fisheye - Japan Camera Hunter
Rare Lens] $160,000 Nikkor 6mm 2.8 Fisheye Can See Behind You | Fstoppers
Rare Lens] $160,000 Nikkor 6mm 2.8 Fisheye Can See Behind You | Fstoppers