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Archive 2012 · What's this on an internal element?
  
 
StevenPA
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p.1 #1 · p.1 #1 · What's this on an internal element?


I'm getting ready to sell my Voigtlander 125/2.5 Canon mount (mint, all accessories, boxed) and need to describe what's on an internal element. It was like this when I bought the lens (used) several years ago and hasn't changed. I'll withhold my opinion because I really don't know what it is and don't want to influence the discussion. I'd also like to know how much this affects the price.

Follow the blue arrows:





Close up:







Dec 29, 2012 at 02:15 AM
Michael Tucker
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p.1 #2 · p.1 #2 · What's this on an internal element?


Delamination? Doesn't really look like fungus.


Dec 29, 2012 at 03:14 AM
flashinm
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p.1 #3 · p.1 #3 · What's this on an internal element?


Looks like cells dividing.

I"d just call it spots on one of the internal elements. It will affect the value some, but probably won't have any measurable affect on image quality.



Dec 29, 2012 at 03:18 AM
Dudewithoutape
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p.1 #4 · p.1 #4 · What's this on an internal element?


Agree, it doesn't look like fungus, but IMHO, delamination is just as serious. I personally have no clue what else it could be nor how it affects the price. Great that it hasn't changed in your years of use. Did the original owner live some place with extreme temperatures?


Dec 29, 2012 at 03:25 AM
pdmphoto
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p.1 #5 · p.1 #5 · What's this on an internal element?


Looks like it got wet inside and then left a residue after drying. Saltwater, beer, or something besides clean water


Dec 29, 2012 at 03:31 AM
StevenPA
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p.1 #6 · p.1 #6 · What's this on an internal element?


Thanks for the comments so far. The lens was purchased new in Korea. It's tough to get a picture of it but is easy to see when I rotate the lens around in the light. It doesn't appear that anything is coming off the element because if it were, there would be little pieces of "coating dust" all over the place, no? It looks like something is on the element. Highly unlikely that it's beer, but you never know!


Dec 29, 2012 at 04:04 AM
Ed Sawyer
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p.1 #7 · p.1 #7 · What's this on an internal element?


Agreed with pdmphoto.

Doesn't look like separation, that always starts at the edges, and looks much different anyway.



Dec 29, 2012 at 04:09 AM
Gary Clennan
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p.1 #8 · p.1 #8 · What's this on an internal element?


I have no idea what that could be... If I blur my eyes a bit it does look like Hite froth though....


Dec 29, 2012 at 04:14 AM
StevenPA
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p.1 #9 · p.1 #9 · What's this on an internal element?


Gary Clennan wrote:
I have no idea what that could be... If I blur my eyes a bit it does look like Hite froth though....


Haha.. An unfortunate beverage if ever there was one.



Dec 29, 2012 at 04:18 AM
 

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JohnJ
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p.1 #10 · p.1 #10 · What's this on an internal element?


pdmphoto wrote:
Looks like it got wet inside and then left a residue after drying. Saltwater, beer, or something besides clean water


+1, condensation, residue, something on those lines. It doesn't look like fungus.



Dec 29, 2012 at 04:46 AM
Javier Munoz
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p.1 #11 · p.1 #11 · What's this on an internal element?


I think that 2 elements glued together are getting separated.


Dec 29, 2012 at 06:18 AM
crazeazn
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p.1 #12 · p.1 #12 · What's this on an internal element?


send it in?


Dec 29, 2012 at 06:47 AM
acme_d
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p.1 #13 · p.1 #13 · What's this on an internal element?


My assertion, FWIW: they're water spots.

This lens was soaked at some point, either a dunk or a really heavy condensation that formed drips on the internal surface. As the drips evaporated their contracting margins drew salts and other soluble contaminants, that were probably already on the surface, toward the centre of these isolated oases, until eventually the contamination piled up deep enough to be seen when the surface finally dried.

You can produce a similar effect by spattering a little distilled water on an apparently clean (but not freshly cleaned) protection filter and allowing it to dry undisturbed.

/Acme



Dec 29, 2012 at 06:50 AM
StevenPA
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p.1 #14 · p.1 #14 · What's this on an internal element?


The spots are isolated on the surface of just one side of one element as far as I can tell, and that element seems to be right in the middle of the lens. Could it be residue or something that was part of the manufacturing process? I don't see how these spots could have gotten there, given their isolation, after the lens was put together. But what do I know, eh? The exterior of the lens seems to be as good as new minus a few scuffs here and there from normal usage. And functionally, it's perfect. Never had problems with the electronics, focus ring, or whatever.


Dec 29, 2012 at 07:19 AM
LightShow
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p.1 #15 · p.1 #15 · What's this on an internal element?


My first thought was water spots.
Anyways, here's a diagram, it may help you figure out which element the marks are on.






http://forum.mflenses.com/viewtopic,p,178975.html



Dec 29, 2012 at 08:01 AM
jcolwell
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p.1 #16 · p.1 #16 · What's this on an internal element?


pdmphoto wrote:
Looks like it got wet inside and then left a residue after drying. Saltwater, beer, or something besides clean water


+1

Also, as Ed mentioned, it doesn't look like delamination.



Dec 29, 2012 at 12:12 PM
Bifurcator
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p.1 #17 · p.1 #17 · What's this on an internal element?


pdmphoto wrote:
Looks like it got wet inside and then left a residue after drying. Saltwater, beer, or something besides clean water


Yup!

It's not any kind of "delimitation" I've ever seen nor does it look like fungus. It for sure looks like dried up liquid. Either it's dirty in there and some humidity bunched up to form droplets that later dried up or it's like pdmphoto is saying here.




Dec 29, 2012 at 01:42 PM





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