CAD Desargues Theorem

http://mathworld.wolfram.com/DesarguesTheorem.html
Here's a nifty piece of geometry that anyone with CAD might enjoy playing with. It has no known use.
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Yes it does, it enables one to prove that Scheimpflug's method for focussing a plate camera on a chosen plane of arbitrary location is indeed correct [and therefore true in all cases].
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Bob Mannix
(anti-spam is as easy as 1-2-3 - not)
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Bob Mannix wrote:

Right here:
http://www.largeformatphotography.info/scheimpflug.jpeg
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