Hi Cory, I imagine it's out of your price range, but I've been very pleased with Sigma's 15mm fisheye. The FOV on a film camera is 10 degrees; not sure what that comes out to on the istD. Anyway, it's extremely sharp and the color rendering is excellent, so I thought I'd throw it out there. Also, it's quite small and easy to carry around. I've had a lot of fun with mine so far.
Amita
