Off-topic -- that would be my specialty....
One of the things I did early on in my architectural career was to go into debt and buy the
Canon 14mmL rectilinear. I don't know what the Nikon equivalent is.
This lens is SWEET. It has great color fidelity, produces very little distortion at all, and is quite fast (2.8 ).
DOF is not really a big factor when you’re using a wide-angle lens. Most interiors are shot at 24mm and under, and the DOF goes to infinity pretty quickly when you’re that short. You can play around with
this calculator to see what I mean.
My lens stays pretty sharp anywhere above f/6.3, so I usually try to avoid going below that, unless I just can’t light something to that exposure.
I leave my lens on autofocus and don’t really care what points it hits, it all comes in every time. Obviously, if I’m doing a funky shot with some object way up in the foreground, a couple of inches from the camera, then that’s a different story.
If you don't want to shell out $2000 bucks for the 14mm, then I'd recommend the
Canon 10-22. This seems to be a nice lens, a lot of shooters are using it to make great images. It does produce some barrel distortion, but if you're careful about composition and you don't mind doing some post-processing correction, it's a good lens. The Sigma equivalent is much poorer - I find that it has excessive distortion and is very soft around the edges.