I canniot post in the pro forum so I thought I would at least drop you a message about the Tokina thread. I have the 12-24mm DX lens that I use on my D200. I really like it a lot and am very glad I bought it. Now however, I recently purchased the new full frame Nikon D3 and cannot use it on that body. I can but only in DX mode. So now I am about to have to shell out even more money and get the 14-24mm f/2.8. Oh well. The Tokina is a great lens if you decide to get it. If you have never seen it, you can go to pbase and see sample imagaes from a number of different lenses. Here is the link to the Tokina 12-24mm sample images.
http://www.pbase.com/cameras/tokina/at_x_124_af_pro_dx
James Newman
http://www.pbase.com/cameras/tokina/at_x_124_af_pro_dx
James Newman