Good fisheye lens for Nikon D-50?

Just wondering if any of you could suggest a good fisheye that is compatible with the Nikon D-50

I guess the obvious answer is the Nikkor fisheye.
http://www.nikonusa.com/...8G-ED.html

Opteka HD² 0.20X Professional Super AF Fisheye Lens for Nikon D40, D40x, D5000, D50, D60, D70, D70s, D80, D90, D100, D200, D300, & D700 Digital SLR fisheye lens does exactly what I had hoped for. I have a Nikon D5000 and enjoy experimenting with different filters and lenses. The price on the Opteka was competitive and the service, packing and delivery time were excellent. Very happy with this purchase.