I'm convinced my life suffers from not owning a Nikon D300 so that decision is a done deal. I'm fixed nicely with a Nikon 80-200 f2.8 AF lens...wise decision 10 yeras back on that one. I recall the days of traveling, unable to get interior shots as I've never had anything wider than a 28mm lens so nows the time while my wallet is open- plus ordering both at the same time can knock another few pct off the total. I'm looking hard at the 12-24 f4 DX Nikkor. Any pro / cons I should be aware of? Or suggestions about other wide lenses. F4 seems slow for a lens as I've always had between 1.4 and 2.8. (except my Nikkor 500mm f5 reflex but that's another story. Perhaps lens speed is no longer a major concern. My salesman could only comment on the future as Nikon's next series of cameras will surely have full frame sensors 'a la D3' and a camera upgrade from the D300 will result severe vignetting with the 12-24 DX ... not so making it obsolete but not a good fit. So that's the other snake in the grass...trying to outguess the future. Were I to upgrade bodies in the future, it won't get sold but given to my grandaughter and I'd like not to be required to purchase another lens at that time. Propably should toss this concern but it's the only neg I've heard. So, then...opinions please...widen my horizon why doncha?