Sigma
15mm f/2.8 EX DG for Nikon
Diagonal fisheye lens
Capture fantastically exaggerated images with this fisheye lens, that covers the full image of a full-frame camera and has a 180 degree field of view along the diagonal. This lens is capable of closing as close as 15cm and has an immense depth of field, allowing you to create dramatic images of a close-up subject with a heavily distorted background, all while keeping much of the image in focus.
Note: this lens does not have a built-in focus motor, and as such will not work with the D40, D40x, D60, D3000, D5000 or other DSLRs without an in-camera focus motor.