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fungus on polarizing filter

 
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Munich



Joined: 16 Jun 2014
Posts: 11

PostPosted: Sat Apr 14, 2018 11:35 pm    Post subject: fungus on polarizing filter Reply with quote

Some fungus inside a pol filter before I attempt to clean it away.
Nikon 5x KNE IR 5x 0.13 on a Leitz Elpro 2 as a tube lens, Oly EM5 MK2


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enricosavazzi



Joined: 21 Nov 2009
Posts: 1078
Location: Stockholm, Sweden

PostPosted: Sun Apr 15, 2018 12:39 am    Post subject: Re: fungus on polarizing filter Reply with quote

Munich wrote:
Some fungus inside a pol filter before I attempt to clean it away.

Interesting picture, but it does not look like fungus to me. My best bet is that the Canada balsam used to glue the plastic polarizing material to a glass sheet has melted due to age and/or overheating, and what you see is a fractal-shaped bubble between the two materials. If so, there is no way to clean it from the outside.

I have seen this type of delamination in old enlarger lenses, probably with the same cause although located between cemented glass elements.
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Munich



Joined: 16 Jun 2014
Posts: 11

PostPosted: Sun Apr 15, 2018 3:00 am    Post subject: Reply with quote

Thank you for your comment. I am sure you are right. Another image at 50x did not show any features.
I will try to take the filter apart. As it is a large well sealed BW polarizer, I expect to have a hard time.
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Olympusman



Joined: 15 Jan 2012
Posts: 3830

PostPosted: Sun Apr 15, 2018 12:43 pm    Post subject: Fungus Reply with quote

1.0 Isn't nature beautiful?

2.0 Nature always finds a way.


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