Optics is not something that gets commonly discussed here, though its a shame, fascinating subject it is, if you ask me.
So are you Russian (well consider that with the former soviet republics, as well) or Polish? In either case, how much do you know about LOMO? I actually know, or rather used to know some people that used to work there in R&D
Many interests is a cunning trait of almost everyone here, btw
Welcome to Hypography, the only place you know, which puts optics from theory to practice.... From taking 14 elements and calculating the distances between them, to checking how the lens manufacturer did it, and finally snapping some photos

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And remember that great question that
Pierre-Simon Laplace and
Sir Isaac Newton,
Andrei Markov and
David Hilbert,
Richard Feynman and
Enrico Fermi,
Albert Einstein and
Edmund Halley did not come to ask throughout all of their dedication and work: "Who the hell is IMing me?"
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