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Waynemel
Tinkerer
Username: Waynemel
Post Number: 140
Registered: 08-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 23, 2012 - 06:17 pm: | 
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I have a Nikon E-series 50mm with a strange visible ring in the internal elements. Is this de-lamination? Is this a problem with these lenses?
What strikes me as strange is the uniformity of the ring. It looks like a perfect edge, like it belongs there. There is a slight change in color on the inside of this ring, like an film or something.
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Hanskerensky
Tinkerer
Username: Hanskerensky
Post Number: 159
Registered: 05-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 23, 2012 - 11:55 pm: |
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Never seen something like this before. Could it be some kind of liquid ? |
Waynemel
Tinkerer
Username: Waynemel
Post Number: 141
Registered: 08-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 24, 2012 - 05:23 am: |
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I was thinking the same thing. As if an oil or something has worked it's way between the elements. The circle is perfectly round, but is slightly off centre.
Unfortunately I am having a hard time removing the rear element so I can't get a better look. |
Waynemel
Tinkerer
Username: Waynemel
Post Number: 142
Registered: 08-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 24, 2012 - 08:57 pm: |
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OK, I managed to get the elements apart. It was exactly as we had suspected...oil had penetrated between the two elements and formed a perfect ring. Fortunately, the two elements had an air space between them, they were not cemented.
I am now trying to clean the glass and re-assemble.
It is surprising how much the oil ring looked like a glass edge...had me fooled. |
Hanskerensky
Tinkerer
Username: Hanskerensky
Post Number: 160
Registered: 05-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 24, 2012 - 11:55 pm: |
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I have seen oil penetrating lenses before but in your case it's very unusual that the oil looks so clear. It's often giving a discoloration.
Good that you can get rid of it so easily ! |
