The other use for these is that you could attach your SLR to the back of a view camera, then using either the sliding function on the adapter, if it has one, or the rear rise/fall and shift movements, you could take several photographs of a larger area, print them, line them up on a light table and cut them with a straightedge and an X-acto knife so they butt together perfectly, and mount them together. At least that's the analogue way of doing it, but it seems much easier just to use a sheet of 4x5" film, if you've got a 4x5" camera.