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Wilbus the jupiter lenses are the poor mans Leica lens often used on Leica cameras. All I know is what I have read online. What I read may or may not be correct. It was basically written that when the Berlin wall was built many of the factories that Leica used, were taken over and their patents were copied to produce lenses. The various camera's that the Russians made for export such as the Zorki range had these M39 fit thread lenses as their kit lens. Photographers in the wets who could not afford the Leica lenses would often use the jupiters. The jupiter 8 is a 50mm f2 . It is the only jupiter lens I own. It is about the same size as the Oly 45 if a tad smaller. A cute lens.
Sounds like a good story, but needs to be corrected a bit. It was not Leica that was taken over, it was some Carl Zeiss factories that were moved to Russia for war reparations. There they continued producing Zeiss designs under different names.
For example, the Jupiter 3 50 1.5 is the Russian version of the famous Zeiss Sonnar 50 1.5 rangefinder lens.
If you're interested in this topic, have a look at
http://www.zeisshistorica.org/sample.html about halfway down the page.
Thanks Opticalflow. I did not have a clue. Bumped into an old guy I know who has only ever used film and never touched a digital camera. He has bags full of Leica gear and on that premiss I imagined he knew what he was saying which is what I conveyed. Once again thanks, now I know.