Fish eye attachments?

Is there such thing as a fish eye attachment for canon lenses?

Something I can screw on?
Its probably a newb question but thats what I am.

What about fisheye lenses? Do any cheap ones exist?

there are fisheye attachments, but the feedback is that they're crap.

and i guess 'cheap' here is relative.
there are currently 4 af fisheye lenses for canon eos systems:
- ef 15mm f/2.8
- sigma 15mm f/2.8
- sigma 8mm f/3.5
- sigma 8mm f/4

but the cheapest option will be the peleng 8mm.

dont forget the zenitar 16mm, too...

and the peleng

Fisheye attachments (those that screw into filter threads) are hideous. Comical and novel once in a while but generally useless.

Canon, Zenitar, Peleng and Hartblei make true fisheye lenses:

http://photozone.de …s/lenses/canon_​15_28_fish
http://photozone.de …ses/peleng_8_35​/index.htm
http://photozone.de …/hartblei_80_28​/index.htm