what us the best kind of fish-eye lens for the Sony alpha a200k slr camera ?

[jesseelb]

i have decided i WILL get the Sony a200k

i will be using it for mostly skateboarding pictures, i will need a fish-eye but i don't know what is the best fisheye lens for this camera, please help ?
i am looking for a good bend and not too much vignette

thank you