wanting to try out a fisheye lens, do cheap lenses like this actually work with slr cameras? i'm assuming they thread into the end of a standard lens, they look like they're designed for camcorders and in my experience those lenses don't work with slrs, or you have to use so many stepup rings it's not woth the effort. I know it's a cheap lens so the quality etc wouldn't be amazing but add a bit of variety to my photography for not alot of cash, which is a plus. otherwise i'd concider buying one of these bad boys i'd love a more expensive tamron or even sony lens with auto focus but as an amateur hobbyist i couldnt justify the extra costs. experience and suggestions please
sony A200 camera before i get canon nikon lens sugggestions 
But, have a look at the Raynox lenses, not a true fisheye, but they do a very wide angle lens (or, they did!) and I find the Raynox quite good quality (for the price).