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Gonzoo
Joined: 29 Mar 2010
Posts: 231
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 Posted: Wed Jun 09, 2010 12:55 pm Post subject: Advice needed: dirt or fungus? |
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Gonzoo wrote:
I've got a CZJ Sonnar lately and discovered some specks (light blue) with surrounding rings (dark blue) in the front element and inner element (or backside of front element). They are only visible from certain points of view... difficult to capture. As far as I can see these are not just air bubbles. On the other hand there are no fungus-like structures (fingers or tendrils).
What do you think: fungus or just dirt?
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Esox lucius
Joined: 26 Aug 2008
Posts: 2441
Location: Helsinki, Finland
Expire: 2011-11-18
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| Posted: Wed Jun 09, 2010 1:23 pm Post subject: |
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Esox lucius wrote:
I think not fungus due to location, shape and distribution. Lack of structure typical to fungus does not support it either.
Looks more like splashes of oil or splashes of some liquid. Could lens have stayed in very hot place and melting lubricant dripped onto lens element? Do you know if lens has been opened and cleaned with liquid at some point? |
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Attila
Joined: 24 Feb 2007
Posts: 57849
Location: Hungary
Expire: 2025-11-18
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| Posted: Wed Jun 09, 2010 1:28 pm Post subject: |
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Attila wrote:
Lens cleaning liquid easily going into a lens and left this kind of trace path.
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Gonzoo
Joined: 29 Mar 2010
Posts: 231
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| Posted: Wed Jun 09, 2010 1:32 pm Post subject: |
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Gonzoo wrote:
| Esox lucius wrote: |
I think not fungus due to location, shape and distribution. Lack of structure typical to fungus does not support it either.
Looks more like splashes of oil or splashes of some liquid. Could lens have stayed in very hot place and melting lubricant dripped onto lens element? Do you know if lens has been opened and cleaned with liquid at some point? |
No clue if it got hot or has been opened. Some lubricant is visible on the lens barrel near the aperture ring. Maybe you are right.
Curious is, that there are specks on different lens elements. If it is melted lubricant wouldn't it dripped only on the lens element next to the aperture? |
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Esox lucius
Joined: 26 Aug 2008
Posts: 2441
Location: Helsinki, Finland
Expire: 2011-11-18
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| Posted: Wed Jun 09, 2010 1:59 pm Post subject: |
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Esox lucius wrote:
| Gonzoo wrote: |
| there are specks on different lens elements. If it is melted lubricant wouldn't it dripped only on the lens element next to the aperture? |
Good specification. Indeed it does not sound like melted lubricant. Maybe more like lens cleaning performed to less than satisfactory standards. Effect on images likely is more psychological than affecting technical quality, judging by the looks. |
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sichko
Joined: 20 Jun 2008
Posts: 2475
Location: South West UK
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| Posted: Wed Jun 09, 2010 3:12 pm Post subject: |
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sichko wrote:
Imperfections in the coating(s) ? Just a guess.
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Gonzoo
Joined: 29 Mar 2010
Posts: 231
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| Posted: Wed Jun 09, 2010 4:04 pm Post subject: |
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Gonzoo wrote:
I managed to get a closer view with a handheld retro 50mm 
Any idea?
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TBaker
Joined: 02 Dec 2009
Posts: 344
Location: Canada
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| Posted: Wed Jun 09, 2010 11:09 pm Post subject: |
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TBaker wrote:
Could it be coating defect? |
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Gonzoo
Joined: 29 Mar 2010
Posts: 231
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| Posted: Thu Jun 10, 2010 6:46 am Post subject: |
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Gonzoo wrote:
| TBaker wrote: |
| Could it be coating defect? |
For me it looks more something on the lens surface than damaged coating. |
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OM
Joined: 15 Jan 2010
Posts: 166
Location: Southern England
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| Posted: Thu Jun 10, 2010 4:50 pm Post subject: |
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OM wrote:
I had similar marks on a Zuiko 50mm F1.8 which cleaned up fine once I had dismantled the lens to get to the inner elements.
I thought they were small fungus spots  |
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ZoneV
Joined: 09 Nov 2009
Posts: 1633
Location: Germany
Expire: 2011-12-02
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| Posted: Wed Jun 16, 2010 10:37 am Post subject: |
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ZoneV wrote:
Î would suppose that are traces of dried cleaning liquid, perhaps some dust or small defect of the coating in the center.
The fungi I saw looked different: http://www.4photos.de/camera-diy/glaspilz.html
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Gonzoo
Joined: 29 Mar 2010
Posts: 231
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| Posted: Thu Jun 17, 2010 9:44 pm Post subject: |
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Gonzoo wrote:
Yeah, I wondered about the missing tendrils too.
I hope its just dried cleaning liquid!
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