Hi Everyone...I have a 7D and would like to get a Fisheye Lens.

I see that the new Canon EF8-15L EF 8-15mm f/4L has finally arrived in Australia...stepping up from Canon's EF 15mm f/2.8 ...but with my limited knowledge about all things fisheye...I'm not sure whether this new very expensive glass is actually better suited to a full frame camera like the 5D & 1D...and perhaps I would be wasting my money if one of the much cheaper (half the price) fisheyes already on the market would be just as good for my 7D.

I'd love to hear from any fisheye enthusiasts about the pros of this new lens on a cropped camera like mine...and perhaps the limitations of those fisheyes already on the market.

Many thanks,

Amanda