Hi forum!
My M42 Auto Chinon 135mm f2.8 is developing some fungus and I feel like I'm in a race with time to save this beauty!
I've finally been able to figure out how to remove the whole focus mechanism. Tricky lens, unlike the smaller 50mm ones. The lens hood was a particularly surprising maneuver.
Anywayz, I now have a lens assembly that seems to be entirely glued (not as in cemeted lenses, but as in glued spacers and glued metal threads and glued glue and everything) so nothing turns anymore and I still cannot remove the front element.
I've successfully got myself a couple cuts and plasters on my fingers just trying to turn the front element out, unscrew it, but it still won't budge.
I've been googling glue removals and there were some suggestions like using acetone and boiling water and other chemicals and whatnot, but I'm not sure any of that is suitable for multi-coated optical elements.
So there. I have no idea what to do now, and having reached this forum from google, I think my best bet is to post my question here, since there seems to be many fine members with the proper knowledge to do such things.
So HEEEEEELP!
I've posted a couple pictures showing the lens assembly without any mechanisms. The aperture mechanism is still at the bottom but i don't think I'll get anywhere by tampering with that. The front element is the way to go. The red arrow in the picture points to the thread of the front element, which won't turn no matter how hard I try.
Hope to find a quick answer as I do not like the sight of those nasty fungi growing in my lens.