Quote Originally Posted by jbognacki View Post
Thanks for the images, links, and info. Anyone interested in selling their copy?
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 N1 lens I am dreaming about.

From some discussion & reading I have done it seems these lenses were used in observatories for astro-graphies.