The highest quality, most expensive peice of glass that you will ever strap to the front of your camera. This lens has gained the nickname the ‘death lens’ because of its vulnerablilty to be struck by any number of objects while filming from the tightest of angles. There are a number of variations of the death lens– one is a 37mm screw mount for smaller video cameras. This lens has been dubbed the ‘baby death’ for obvious reasons. It come with a rubber lens hood which probably wouldn’t save the glass from being hit by a flat surface. This style sells as cheap as $200, and retails for $300. Next there is a model for the VX1000 which has a proprietary bayonet mount and no lens hood. This lens on a VX1000 offers the widest, most distorted fisheye image available (with the slightest of vignetting). There are a couple of models available for the VX2000. The most popular one is the Mark II bayonet mount. It is not as wide or as distorted as the VX1 lens, but it does have a metal hood, which I have seen save the glass a number of times. There is also a 58mm threaded version of the MarkII, which can be used on any camera with 58mm threads, or by using step rings. I am almost positive that this setup will give you almost a full ring of vignetting. There also exists an elusive Mark I intermediate lens which has a bayonet mount for the VX2000/2100 that will give you a wider, more distorted image (by a small margin) but still not as wide as the VX1000 lens. There are also lenses made for the Panasonic DVX series cameras which are bayonet mount and vignette a small amount.
Most of these lenses retail for $700+, but I have seen them go on eBay for around $600.