android
Tilt/Shift lenses have been available for SLRs since the 70's, I think. They give you the opportunity to make many of adjustments that used to be exclusive to view cameras... Nikon makes a few, but I believe that Canons 35mm TS was the first, for 35mm film.

PeterN
OK. the reason I got the D800 was for W/A. I would have to give a lot of thought to the purchase. I really like the look of a W/A. Though the widest I have is a 16-35. Unless I go to a POS Sigma, I can't find one that accepts filters. (I also do long exposures and IR.)