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220º fisheye

Asher Kelman

OPF Owner/Editor-in-Chief
Hi Stuart,

Now that's an impressive piece of glass, try keeping you feet out of the image ..., it's impossible unless it's pointed upwards.


Daily Mail: 6mm Nikon Fisheye ~1972

"Impressive" you say? It's damn overwhelming!

But where are the photographs tasked with it?

Can someone explain how it can shoot behind its self?
Hi Mark,

Well not literally straight behind itself, but wider than 180 degrees. I assume that the front element has an extremely short radius of the inner surface and a large radius of the outer surface. That creates a thin lens on the optical axis and thick towards the edges. Refraction does the rest. Maybe somebody can dig up a diagram of this lens somewhere to illustrate the principle.


P.S. I've found sort of a diagram:

Dr Klaus Schmitt

Active member
I had that one, but sold it later for a good price. Darn big and heavy monster lens :biggrin:

Read what my friend Macro Cavina has written about Nikon fisheyes (incl. prototypes of them) HERE on his site

This link explains the principle of operation very well, including this picture of teh 2.8/6mm function:

and here an image shot with it:

(c) Kubetschek.de