A good fisheye lens/attachment for Nikon a D90?

A good fisheye lens/attachment for Nikon a D90?
I'm looking for a good fisheye lens/attachment for a nikon d90, i've found this:

http://www.amazon.co.uk/...001LZQGJM/

but i'm a bit reluctant to order it from america, any help?

Well… You get what you pay for. A real fisheye lens costs at least $300 (the Samyang 8mm f/3.5, sold under various names), the big brand ones $500 and more.

From that adapter lens you can expect rather horrible image quality, but then again it's relatively cheap. Considering that fisheye lenses are a rather special application and many people use them perhaps half a dozen times and then they begin to gather dust on the shelf, it may not be a good idea to pay the price for a real fisheye lens.

What's even up with all the people suddenly asking for fisheye lenses? The frequency of these questions seems to have increased a lot.

You can consider 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

Included - .20x Fisheye Lens, Lens Adapter, 52mm Adapter, 55mm Adapter, 58mm Adapter, 67mm Lens Caps, Lens Pouch
An essential tool for extreme sports and dramatic action shooters
High-index / low-dispersion optical glass, Fully multi-coated, every element
Designed to maximize day and night shots by providing maximum light and image
Made and designed in Japan, Brand new, Lifetime warranty