I guess I’m a total tard or something. I don’t see what the purpose of this would be. I can’t tell the big difference in the photos taken using this method.

The benefit of using a DSLR with a bellows with adjustable standards is really only limited to product, especially food, and architecture photography. There area few tilt/shift lenses on the market, but to my knowledge, none of them allow for the lens to be tilted and swung at the same time, you can only do one or the other. In other words, you can’t tilt the lens vertically and horizontally, you have to pick one. The only time you would really ever use that is shooting architecture though, so it’s not really that big of a deal.

You get a shallow depth of field by tilting the lens, effectively moving the plane of focus, which is normally perpendicular to the sensor. When you tilt, you can have both depth of field and the background out of focus, so you can shoot f/8 and still blur the background, make sense? In food photography this allows the entire dish to be in focus, yet blur the background. If you just shot this with a large aperture, you would lose focus on the front and back of the dish.

Most of the time that is just fine though, so the tilt/shift is really only necessary for commercial applications.