Close John but it's 2mm short-) It's okay not a big problem cutting filters for the rear.

http://www.rugift.com/photocameras/p...sheye_lens.htm

That's an 8mm fisheye for 35mm cameras. It's not full frame and it'll need an adapter [M42 mount I think] for a Canon camera. You might want to check what the lens averages on Ebay.