Nikon 10.5mm f/2.8G ED AF DX Fisheye
Taken at Phoenix International Raceway
Nikon's fisheye lens is a joy to use. It's small and lets in a lot more light than its f/2.8 aperture would suggest. Perfect for getting big images out of small areas. This lens deserves a place in your bag.
While not as versatile on the FX bodies, it still creates unusual images that people are drawn to. Also, you'll notice strong CA at the corners (can be fixed using Nikon Capture software). When using the fisheye, you might consider shooting RAW as there's so much to each image, you'll want to edit different parts individually.
Example:
Nikon D40x : @10.5mm : 1/200th : f4 : 100 ISO : Matrix metering 