Nikon Nikkor 8mm f/2.8 AIS Circular Fisheye 2.8 | Rafael CA | Flickr
Using the Nikon 8mm f/8 Fish-eye Nikkor as Intended: for SCIENCE! | Fstoppers
Nikon Fisheye Nikkor 8mm f/2.8 AI Review
UsedPhotoPro on Twitter: "#foundatUPP: Here you see the Nikon Nikkor AI-S 8mm f/2.8 fisheye. Three versions of this lens was manufactured over the span from 1970 to 1997: non-AI, AI, and AI-S.