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Dad Photographer
They changed the leaded glass (which is also in the original 8-elements Summicron) to something else for the later production runs as far as I know.
I do not know if that constitutes "better" as one would have to bench test them against another, but I guess more authentic would be a way to put it.
Mine is a first run one.
I also received an early first run lens.it was sent back to LLL by Kevin to correct some aspect of cosmetics.
