The Nikon 6mm f/2.8 is claimed to be the world’s widest fisheye lens which is capable of seeing things behind itself and offering a viewing angle of 220-degrees. It’s most likely the world’s most expensive camera lens, which sets you back around $160,000.
The fisheye lens isn’t something new, it’s a vintage, has existed since 1972 and you can only get it through special order. The lens was also shown off at the Photokina trade show in Cologne, Germany in 1970, where it managed to cover the 24x36mm image area.
The lens weighs a whopping 5.2kg, is 171mm long and has a diameter of 236mm. The lens has been placed on sale for £100,000 or $160,000 USD on Graysofwestminster.