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.
NIKKOR 8MM FISHEYE
Nikon 8mm f/2.8 Fisheye
Nikon Fisheye Nikkor 8mm f/2.8 AI Review
Sigma 8mm f/3.5 EX DG Circular Fisheye Lens for Nikon F 485306