Walt--I went to the link and there is a newer version of the lens with autofocus/AF-S. Is that necessary with the D7100? The price point for the newer lens versus the older, used lens is not huge. Sometimes newer is not better, however...
The forum added the link. Ha! I have the Tokina 11-16mm f2.8 (IF) DX II. I'm not sure if there is a newer version, but this one works well for me.