The Fisheye-Nikkor 6mm f/2.8 lens, first produced in 1970 at the Photokina trade show in Cologne, is a 220? fisheye Nikkor with an astonishing speed of f/2.8. It is the world?s most extreme wide-angle lens to cover the 24 x 36mm image area (at the time) with a massive glass dome which dwarfs the camera attached.
The lens officially went into production in 1972 and uses 12 glass elements in nine groups with a total weight of 5.2kg. The extremely wide-angle lens from Nikkor is available via graysofwestminster for ?100,000 GBP (approximately $161,000USD).
http://hypebeast.com/2012/04/nikkor-6mm-f-2-8-fisheye-lens/
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