This is why, in my original post. I wrote „tilting the lens and/or back“
Well, it took two thousand years and people like Gauss, Bolyai and Lobatschewskij to solve the riddle of Euklid‘s so-called parallel axiom. Thus I feel no shame to admit the error of my ways
This is true for TWO planes. However, with focus plane, lens plane and film plane we have THREE planes. Thus, in geometry, it is very well feasable to have three planes intersect merely at one point in space (visualize e.g. two orthogonal planes and a third one angled at 45 degrees with regard to both of them). That this will not happen in photography, has been convincingly explained by Rick Denny in post #7, pointing out that the focus plane is not a degree of freedom but is „tethered“ to the other two planes and determined by them.
Scheimpflug in photography really is a strange mixture of pure mathematics, empiricism and art. I appreciate all answers and comments. I have benefited.
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