Quote Originally Posted by Kevin Kehler View Post
I also considered that what-you-see-is-what-you-get and if the building is not straight on the ground glass, why would it be straight on the film?
If you want the building to be straight in the photograph, it has to appear straight on the ground glass. This is why lenses with movements are called perspective correction lenses in the small format world.

If you want the camera to be level, it has to be level (actually, the film plane and lens have to be plumb). Those two things are separate.

Maybe I'm missing something, but the base plate of a field camera has very little (none) impact on the image, so leveling that is only in aid of squaring off the front and rear standards.