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yusuf
Joined: 19 Jan 2013
Posts: 68
Location: India
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 Posted: Wed Aug 21, 2013 6:48 am Post subject: Fungus or something else? |
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yusuf wrote:
I am planning to buy a lens locally and noticed this on the rear element. Any idea what is this? First I thought that it was fungus but after some closer inspection, it looks something else. Another clue is, I noticed some green fluid leakage at mount.
Any idea?
Thanks
Yusuf
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guardian
Joined: 18 Mar 2009
Posts: 1747
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| Posted: Wed Aug 21, 2013 12:44 pm Post subject: |
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guardian wrote:
What is the lens?
That could be fungus or it could be commencement of separation. I lean gently in favor of the latter possibility.
The green fluid you mentioned, if from an internal source, is likely (former) helicoid grease. Of course it could be from an external source and if so it could be anything.
I have a Hexanon that leaks a tiny bit of blue helicoid grease, though not at the rear of the lens. |
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inombrable
Joined: 20 Mar 2012
Posts: 545
Location: Salamanca, Mexico
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| Posted: Wed Aug 21, 2013 1:11 pm Post subject: |
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inombrable wrote:
That looks to me like oil or grease on the glass, it could also be separation but I would go more with some kind of oily residue on the back element.
Don't think is fungi. |
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yusuf
Joined: 19 Jan 2013
Posts: 68
Location: India
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| Posted: Wed Aug 21, 2013 1:28 pm Post subject: |
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yusuf wrote:
| inombrable wrote: |
That looks to me like oil or grease on the glass, it could also be separation but I would go more with some kind of oily residue on the back element.
Don't think is fungi. |
Actually both the side of the rear element is clean. A local repair shop opened and cleaned it. This is inside the rear element, so it's likely to be the separation
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inombrable
Joined: 20 Mar 2012
Posts: 545
Location: Salamanca, Mexico
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| Posted: Wed Aug 21, 2013 4:20 pm Post subject: |
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inombrable wrote:
there you have it !!! |
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visualopsins
Joined: 05 Mar 2009
Posts: 10362
Location: California
Expire: 2021-06-22
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| Posted: Wed Aug 21, 2013 10:19 pm Post subject: |
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visualopsins wrote:
I think that is edge of the coating. The edge along the perimeter has been got under, then corroded by grease (or fungus).
Bokeh highlights may be dark circles, similar to mirror lens, not as much.
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Cameras: Sony A7Rii, Spotmatics II, F, and ESII, Nikon P4
M42 Asahi Optical Co., Lenses:
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Attila
Joined: 24 Feb 2007
Posts: 57939
Location: Hungary
Expire: 2021-11-18
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| Posted: Thu Aug 22, 2013 12:57 am Post subject: |
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Attila wrote:
Surely not fungus.
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ZoneV
Joined: 09 Nov 2009
Posts: 1648
Location: Germany
Expire: 2011-12-02
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| Posted: Sat Aug 24, 2013 9:13 pm Post subject: |
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ZoneV wrote:
Looks very much like Delamination. The glue between two lens elements no longer hold the elements fully together.
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