Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

Recommended Posts

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

tal1.jpg

Tal2.jpg

Share this post


Link to post
Share on other sites

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

Edited by Alien 13
  • Like 2

Share this post


Link to post
Share on other sites

Thanks. I must dismantle it and have a closer look then. The view through it is actually ok (in daylight anyway).

Ant

Share this post


Link to post
Share on other sites

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.

Edited by dyfiastro
  • Like 1

Share this post


Link to post
Share on other sites
2 minutes ago, A McEwan said:

IPA? Er... India Pale Ale?

Isopropyl alcohol 

  • Like 1

Share this post


Link to post
Share on other sites

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:

image.png.2bbfaed1a70f642f7b84050bbf86659c.png

  • Like 2

Share this post


Link to post
Share on other sites

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.

 

Share this post


Link to post
Share on other sites

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

  • Like 2

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.