Fish eye lenses may be the norm in skateboarding photography but there's nothing about them that's intrinsically useful. It used to be that fisheye lenses were used because they were the only super wide angle lenses around. Now that 35mm lenses pushing 10mm focal lengths are available with better aspherical designs to compensate for wide-angle disortion and light fall-off, true fish-eyes are nearly a thing of the past. Unless you've got the need, the cash, and the balls to shoot with something like a 6mm or 7mm Nikkor (which any mere mortal would have a very difficult time finding, let alone affording) there is no reason to shoot with a fish-eye. Correct me if I'm wrong, but I don't believe skateboarding has ever been about sticking to norms. Just because you've seen one too many fish-eye shots in Thrasher or something, doesn't mean you need to shoot like that.