dourbalistar
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From those diagrams the 50/1.8 Nikkors all look the same, but they aren't - the glass types and coatings are different, and the curvatures must have been modified for at least some of them because the distance between the front element and the back element is not the same for all of them.
I love the trichromes dourbalistar.
Marty
Thanks, Marty! Appreciate the kind words, and the info about the differences between the 50/1.8 Nikkors.