@jeff - sorry, meant to say too long. (duh)
@cptczar - I love my a900 and the associated Zeiss glass that I have, so I don't want to switch. Sony is supposed to be replacing it early next year with a full frame monster in the Leica S2 category as far as megapixels go, and I presume it will be mirrorless and with Liveview. A further incentive to stick with Sony.
When I look at the price of the Hartblei, I could buy both the 17mm and 24mm Canons for less money than one Hertblei. Sobering thought. I'm told the issue with using Canon tilt/shifts with Sony mount is that the Canons use AF and there is no way to manually focus when mounted on a Sony A mount - and obviously, the AF won't work either. Not sure if the NEX E mount has the same issue or not, but I really don't want yet another camera body - may as well just go to a Canon body and be done with it.
I want this for architecture and although I do a reasonable job in Photoshop of correcting the perspective, I loose too much of the original frame in doing so.