What is the equivalent of this lens in nikon world?

[Kym]

I read Kenrockwell's review and on D90 he recommended ...

Then do whatever he does not recommend.

Quoting Ken... http://www.kenrockwell.com/about.htm

This website is my personal opinion. <snip> this site is my "aggressive personal opinion," and not a "logical presentation of fact."

[arthurking83]

Then do whatever he does not recommend.

....

and

(with one caveat) get the Tokina 11-16(which he strangely recommends!? ) if you know Ken Rockwell, he has always been anti third party lens, so to hear that he's recommended a non genuine lens over a Nikon lens... well hell just froze over I reckon!
Forget the limited zoom range. You don't usually get an UWA lens to use it as a WA lens.. 98.79% of your focal length usage will most likely be at 14mm or less anyhow... so you'll find that 16mm is probably too long