This Uber-Rare Nikon 6mm f2.8 Fisheye Lens Can See Behind Itself - The Phoblographer
An image taken with a 6mm f/2.8 Fisheye-Nikkor lens | Flickr
Rare Lens] $160,000 Nikkor 6mm 2.8 Fisheye Can See Behind You | Fstoppers
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
Deal of the day: Nikon Fisheye-Nikkor 6mm f/5.6 circular fisheye lens for $5,999 - Nikon Rumors
The remarkable Nikkor 6mm f/2.8 Fisheye - Japan Camera Hunter
Lens pr0n: The Nikkor 6mm f/2.8 fisheye monster | TechCrunch
Why Use Fisheye Lenses?
Camera Geekery: The Nikkor 6mm f/5.6 Fisheye Nikkor aka The Holy Grail - Japan Camera Hunter