I have a work colleague in another country that has just recently purchased the following combination in order to take the photographs and then email them to me for stitching etc.
Canon 5D MKII
Canon EF 8-15mm fisheye
I have the same set up except my lens is the earlier Canon EF 15mm f/2.8 Fisheye lens and I use 78 for the top rail and 58 for the bottom rail. I'm not too sure if the 8-15mm fisheye would need any changes in the settings so am hoping to get some advise on this forum please from anyone else that has the same set up.