I've a Jupiter 12 in Contax/Kiev mount, but I'm absolutely not satisfied about the results.
My Kiev's rangefinder seems to work fine with the Jupiter 8, the Jupiter 3 and - I hope - with the Zeiss Sonnar f/1,5 that is shipping to me.
In my opinion my Jupiter 12 is always blurry and offers low contrast.
I would like to have a feedback from you about it
May be a focusing problem? I remember I've read in a post about fixing problems like this on a Jup12 with DIY operations, but I can't find it.
Than, if I'll realize that it's an unlucky one, I'll replace it with another one.
Just want to try...
Can u suggest something?
Here you can see some examples: