If you’re looking for the daddy of all fisheye lenses then this Nikkor 6mm f/2.8 Fisheye Lens is it. With a massive 220° range (40% wider than standard fisheye lenses) it is the widest lens available and produces a circular image on the film. It has such an angle range that it can actually see behind itself.
This awesome fisheye lens weighs in at 5.2 kg and has only made via special order. Unfortunately there are no details on price but I can imagine this beauty would definitely force you to remortgage your house.
If price is not an issue, it will perfect for many photographic situations where you need a high performance wide angle lens with extreme wide coverage for low light photography, or scientific and researchers photography, this fish eye lens is indeed the daddy.
More technical information about this amazing fisheye lens can be found at mir.com
Via Crunch Gear