Carl Zeiss Jena Ernostar 1.8/24cm just sold on an auction for 7800€ + 20% auction fee. I just didn't have enough money to go for it, although this is probably the Nº1 lens I am dreaming about.
From some discussion & reading I have done it seems these lenses were used in observatories for astro-graphies.
Best,
Milos
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