Hi rasdeep, thanks for the heads-up on the adaptor and will get one that have the aperture control ring.
Yeah, the Tokina 11-16 have rave reviews and seem like a great lens. However, I think my problem is that I know how "long" I need for the UWA but can't make up my mine how "wide" is so call "right".
For the "long" end, I think I need 24 mm (equivalent to 36) so that I can use the lens more (like street or indoor) and don't need to keep swapping lens since 16mm or even the Sigma 20mm seem a bit short. So looking for the "long" end to be 24 mm.
But the "wide" end, I am completely clueless.

:embrass::hung:
If I know (and I don't know and I don't have experience) that 12 is good enough, I will go for the Tokina 12-24. But I check so much on the web and seen so much pictures from 10 mm and 12mm that I think 12mm maybe OK but better get 10mm. This is where I hope can get some more advice.
If indeed, it is great to have the 10mm at the "wide" end, I guess I will cough out the $$$ for Nikon. But the $$$ difference with the Tokina is so much so I don't want to buy a 10mm wide but end up mostly using 12mm (but I don't have experience to know).
Anyway, thanks to anyone who comment one way or the other :thumbsup: