_Tokina AT-X 107 AF 10-17mm DX Fish-Eye f/3.5-4.5
This is a fun lens. I sold it to get myself the Tokina 11-17mm non-fish-eye lens, but that was a mistake. It can't be used as a wide-angle lens, but it can give cool and artistic effects. I guess you can do some post processing to do the same thing. I don't how effective it is, but I'm sure with today's technology it can look just like the real one. Anyways, this fish-eye lens is rare in the fact that it is also a zoom lens. That little bit of zoom range actually can make things different, especially when you are shooting upward (taking pictures of the ceilings or domes indoor) you can't control the distance to the object unless you use a zoom lens. Here are some sample pics.