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Author Message   Jdvores Tinkerer Username: Jdvores Post Number: 5 Registered: 04-2013 Rating: N/A Votes: 0 Posted on Saturday, June 01, 2013 - 09:58 pm:    If only the front element looks fungusy, you need a lens spanner and you need to take off the ring with the nameplate. There might be another ring underneath that and then the lens element falls out. Remember which way it went and put it back after cleaning. If it's the rear element, I'm not as sure. If you have to take apart the whole thing, try and find a guide online before you screw up the helicoids. They're hard to put back together so that it focuses properly again. Here's a sight I found just by googling - http://oomz.net/tessar/ Maybe it'll help.