Fish Eye Lens for SLR Camera?

Hello group,

My boss wants me to find out about a good Fish Eye Lens for our SLR cameras. We have several Canon Rebel XTIs, nice Canon 40D, and a Nikon.
Can you recommend a good Fish Eye Lens for these cameras?

Would one Fish Eye Lens work on all the cameras? And if so, would it be interchangeable with the Nikon?

Thanks for your help.

You need an adapter to connect Canon lenses on a Nikon or other way round.
There are quite a lot of fisheyes around...here is a Sigma...

http://www.sigma-photo.com/lenses/le...79&navigator=4

I use the 8mm Peleng Fisheye. Its cheap,russian and manual.

www.rugift.com is one reseller.

I use it for effects but mostly for Panoramas , 360x180, like http://www.pellepiano.com/qtvr/peleng/gl_karusell.html.