A McEwan Posted August 14, 2019 Share Posted August 14, 2019 Hi. I wasn't sure where to post this, so here it is. I fished out my TAL 6x30 finder from cupboard where it's lain for the last couple of years, and found this. Is it, as I suspect, fungus? If so, is it completely on its way out now? Ant Link to comment Share on other sites More sharing options...
Alien 13 Posted August 14, 2019 Share Posted August 14, 2019 Dont think its fungus, looks more like moisture has got into a cemented element. I had a lens like this and put the element into warm soapy water for a few days and it separated, I then cleaned off the "cement" with some alcohol then refitted the lens assembly using a thin strand of copper wire around the edge to "air space" it, worked fine after.. Alan Link to comment Share on other sites More sharing options...
A McEwan Posted August 14, 2019 Author Share Posted August 14, 2019 Thanks. I must dismantle it and have a closer look then. The view through it is actually ok (in daylight anyway). Ant Link to comment Share on other sites More sharing options...
dyfiastro Posted August 14, 2019 Share Posted August 14, 2019 This may sound excessive but I have just recently treated fungus on a lens (not that bad). I used an mild IPA solution and allowed it to sit for a few hours and then rinced off. This was followed by a mild peroxide solution to kill off any remaining fungus. I also wiped down the inside of the tube. This was followed by a further rinse with a combination of IPA and distilled water. There is now no signs of fungus on the lens and it did not effect the coatings either. Link to comment Share on other sites More sharing options...
A McEwan Posted August 14, 2019 Author Share Posted August 14, 2019 IPA? Er... India Pale Ale? Link to comment Share on other sites More sharing options...
tooth_dr Posted August 14, 2019 Share Posted August 14, 2019 2 minutes ago, A McEwan said: IPA? Er... India Pale Ale? Isopropyl alcohol Link to comment Share on other sites More sharing options...
John Posted August 14, 2019 Share Posted August 14, 2019 I think that is an issue with the cement holding the lens elements together as Alan / Alien 13 says. I've seen fungus on a lens and it looks different. More like this: Link to comment Share on other sites More sharing options...
A McEwan Posted August 14, 2019 Author Share Posted August 14, 2019 Good, I'm relieved it's probably not a fungal problem. I will take some time at the weekend and open it up and follow the advice above. It's a nice finder and it would be a shame to have to lose it. Link to comment Share on other sites More sharing options...
philj Posted August 14, 2019 Share Posted August 14, 2019 Nah thats not fungus Ant. Its the 2 elements separating, maybe moisture related but more than likely the cement. Ive never been able to do anything for optics that suffer this. Its still useable but doesnt look pretty. If its on the finder its not so bad. This is another reason I dont like cemented optics Link to comment Share on other sites More sharing options...
GlenM Posted August 15, 2019 Share Posted August 15, 2019 Yep, delamination. Glen. Link to comment Share on other sites More sharing options...
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