Tilt (or swing) is done by changing the sharpness plane from being parallel to the lens and film planes in 0-position (lens and film planes parallel) and get it in a position where the extension of the depth of field becomes smaller, thus allowing for less stopping-down for the same depth of field (sharpness).
The effect can be huge, saving sometimes 3, 4, 5, ... f-stops. Sometimes, when the subject extends the same in all 3 dimensions of space, it brings nothing. in Some situations you can get all sharp, from front to infinity at f 5.6
So it always depends on the subject.
I'm ideally looking for an example of the depth of field I can create with tilt on technical plate cameras. Wide and/or Long lens. Is the effect minimal given the usual 5.6min aperture on so many of the Digitar lenses? Am I forced to shoot 4x5 when I need shallow depth of field? I know a lot of the forum shoots at optimal f11 most of the time, but I have been extremely happy with the results from my 47mm Digitar at 5.6 on my Cambo WRS1000 body.