Michael, that's an impressive amount of work ... I'm suggesting you talk to the the Schneider folks not for a debate, but for some clarity on the situation. I certainly can't comment--I don't understand this aspect of lens design, and i don't understand the math, and there are some things I'd rather do than struggle to figure it out (including carving portraits of satan into my belly)!
Ulrich might be mistaken, or we might be misunderstanding each other. His grasp of optics is a bit beyond his grasp of english.
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