Nikon 10.5mm Lens
Nikon 10.5mm Fisheye Lens
A fisheye lens, any fisheye lens is a very dedicated lens to a specific look. The notion is that you are looking from the eye of a fish, hence the name. The fisheye offers a distorted yet interesting and artist look at the world.
The following video does a good job at showing you how to use and the benefits of using a fisheye lens.
For a bit of fun, check out Kai W's video as he is always amusing.