Hmm, my back doesn't move as easily as it used to.... but if you're referring to my camera's back, I often make use of that when tilting the camera downward. If only front tilt is used to handle plane of focus distribution, it requires a far larger image circle than using or combining the rear tilt option, or requires a smaller f-stop, or counting on the less than ideal nether realm of the image circle rather than the center. Learning to use back tilt is therefore valuable. And of course, geometric perspective is affected differently, so that in itself becomes another correction tool, relative to front vs rear tilts or combination thereof. Swing is analogous. But Rise vs fall - either way, no difference. My 8x10 flatbed doesn't even have rear swing of height adjustment; but I like it that way for its overall simplicity and rigidity. My Sinar monorail does it all.
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