Hi all, I just joined this forum and straight from the start I have a big thing (at least big for me) with which I would like your help!
I recently bought a batch of old m42 lenses for about 25 euro's. I was looking for an 28mm 2.8 and the batch had a pallas auto 28mm 2.8 lens + a pentacon 50mm 1.8, a pentacon 200mm f4 (15 blades version) and a Carl Zeiss Jena 135mm 3.5 MC (sonnar). All lenses are physically in great condition and look/feel like good quality, solid lenses. I especially love the look and feel of the Carl Zeiss Jena! Of course they each have a bit of dust on the inside, but not so much that they are no longer worth it.
However, the Carl Zeiss Jena lens is in critical condition. It's filter thread is dented, the diagram is stuck and there is some fungus visible on two or three elements. From what I have read, this lens can be amazing. Sadly the current condition obviously leaves the lens working at only a small percentage of its potential. See Images for details.
One of the purposes that I would like to use this lens for, is to use it as a tube lens for a macro set up. I have read that it delivers very well in this aspect. I naturally also want to use it for other things than just macro.
So my question is, do you have any tips for me as to fix this lens? I am relatively new to these lenses, so I am afraid to open it up and possibly do more harm than good. But it's a waste to just let it gather more dust in my cabinet. Any help will be greatly appreciated!
Thank you very much in advance!