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assaf
Joined: 02 Mar 2010
Posts: 26
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 Posted: Fri Mar 26, 2010 10:43 am Post subject: What is that?? Fungus? Cleaning marks? |
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assaf wrote:
I got a pancolar and at some point noticed this all around the perimeter (center seams clear):
It is only visible at certain angles and light. There is also something on the rear element (with some color hues) which I couldn't quite make visible in a photograph.
Is this fungus? Cleaning marks? Do you think it will affect IQ?
Sorry for panicking...
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pich900
Joined: 10 Jun 2007
Posts: 1745
Location: The Netherlands/Zwolle
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| Posted: Fri Mar 26, 2010 10:51 am Post subject: |
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pich900 wrote:
Hi!
On your picture, it's looks like more cleaning marks than fungus.
Make some test and you will probably quickly see if it's affect the results/contrast on your pictures  ..
But did you try to clean it? |
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Spotmatic
Joined: 18 Aug 2008
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Location: Netherlands
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| Posted: Fri Mar 26, 2010 10:53 am Post subject: |
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Spotmatic wrote:
Looks indeed like cleaning marks to me! Is this on the front of the front element, or behind it on an inner glass surface?
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peterqd
Joined: 28 Feb 2007
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Location: near High Wycombe, UK
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| Posted: Fri Mar 26, 2010 11:00 am Post subject: |
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peterqd wrote:
| Spotmatic wrote: |
| Looks indeed like cleaning marks to me! Is this on the front of the front element, or behind it on an inner glass surface? |
Me too, certainly not fungus. It actually looks like dried residue of whatever fluid was used last, so I would expect it to disappear if the lens is cleaned properly.
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Attila
Joined: 24 Feb 2007
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| Posted: Fri Mar 26, 2010 11:28 am Post subject: |
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Attila wrote:
| peterqd wrote: |
| Spotmatic wrote: |
| Looks indeed like cleaning marks to me! Is this on the front of the front element, or behind it on an inner glass surface? |
Me too, certainly not fungus. It actually looks like dried residue of whatever fluid was used last, so I would expect it to disappear if the lens is cleaned properly. |
+1
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ludoo
Joined: 18 Sep 2009
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Location: Milan, Italy
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| Posted: Fri Mar 26, 2010 11:53 am Post subject: |
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ludoo wrote:
The color hues on the rear element might also be due to a liquid used to clean the element evaporating. The best way to remove them (at least in my experience) is to get some pure acetone from a paint store, then lightly dip a q-tip in it and quickly wipe it on the glass. It will evaporate almost instantly without leaving any marks. If the marks on the front lens are cleaning residues, it will work great for them too.
Be careful of two things though, as acetone is a nasty chemical: a) it's toxic and extremely flammable, and since it evaporates almost instantly you might have a fire even with a flame not that near to it; and b) it dissolves plastic and paint, so go carefully around the perimeter of the lens so as not to damage the lens barrel, rings etc. |
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assaf
Joined: 02 Mar 2010
Posts: 26
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| Posted: Fri Mar 26, 2010 3:01 pm Post subject: |
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assaf wrote:
Thanks for reassuring me.
I haven't touched it yet. I'll get some q-tips and try.
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m4/3: 14-45/3.5-5.6, 20/1.7
Konica AR: Konica Hexanon 50/1.7, Konica Hexanon 40/1.8, Vivitar 135/2.8, Vivitar 200/3.5
M42: CZJ Pancolar 50/1.8 Zebra, Helios 44M 58/2
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motleypixel
Joined: 12 May 2010
Posts: 135
Location: Austin, TX USA
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| Posted: Wed Jun 02, 2010 6:56 pm Post subject: |
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motleypixel wrote:
I just recently fixed oily aperture assy on a rokkor 58/1.4 and upon rebuilding it I cleaned all the elements the same way (rocket blower, micro-fiber cloth with my breath). I don't know why the front element behaved this way but the inside of the front element became severely "cleaning marks" marked...almost like streaky oil marks that won't come off. Should I try this acetone method?
Thanks,
Roy
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ludoo
Joined: 18 Sep 2009
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| Posted: Wed Jun 02, 2010 7:09 pm Post subject: |
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ludoo wrote:
| motleypixel wrote: |
| I don't know why the front element behaved this way but the inside of the front element became severely "cleaning marks" marked...almost like streaky oil marks that won't come off. Should I try this acetone method? |
I think they're just marks left by the humidity in your breath evaporating. I'd use pure acetone: get it from a paint store, so it's pure and not mixed with other substances.
What I do is use q-tips: I dip one in acetone, then quickly pass it on the lens with a very light pressure, almost like a feather touch. As the q-tip dries, look for smears on the lens and clean them, then change to a fresh q-tip and dip it again, repeating the procedure until the glass is clean. It helps working under a light and angling the lens so that you can clearly see the smudges on the lens coating. |
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motleypixel
Joined: 12 May 2010
Posts: 135
Location: Austin, TX USA
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| Posted: Wed Jun 02, 2010 7:19 pm Post subject: |
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motleypixel wrote:
Thanks I'll give that a try. I don't think it was my breath issue because I cleaned all the other elements the same way. It may actually be oil but not sure.
I also have lint free 4"X4" pec pads that are used to clean DSLR sensors...absorbent, soft, and lint free that I may be able to use too.
-Roy
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motleypixel
Joined: 12 May 2010
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Location: Austin, TX USA
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| Posted: Thu Jun 03, 2010 2:30 pm Post subject: |
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motleypixel wrote:
Well the acetone didn't work. I don't know how and then hell I mucked up this element. I used micro-fiber cloth and breath at first and then I used a pec-pad (again these are probably better than micro-fiber) and Eclipse fluid aka methanol...maybe this did it. There are scratch-like-oily streaks that are now seemingly permanent. Ugggggg!
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ludoo
Joined: 18 Sep 2009
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| Posted: Thu Jun 03, 2010 2:43 pm Post subject: |
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ludoo wrote:
| motleypixel wrote: |
| Well the acetone didn't work. I don't know how and then hell I mucked up this element. I used micro-fiber cloth and breath at first and then I used a pec-pad (again these are probably better than micro-fiber) and Eclipse fluid aka methanol...maybe this did it. There are scratch-like-oily streaks that are now seemingly permanent. Ugggggg! |
Very strange. What kind of acetone did you use? |
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motleypixel
Joined: 12 May 2010
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Location: Austin, TX USA
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| Posted: Thu Jun 03, 2010 2:55 pm Post subject: |
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motleypixel wrote:
Acetone from our local Home Depot's paint department 1qt. The can says ACETONE. Is methanol bad to use because I used that too.
-Roy
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Last edited by motleypixel on Tue Jun 08, 2010 2:27 pm; edited 1 time in total |
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unclemack
Joined: 21 Jun 2009
Posts: 51
Location: UK frozen north
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| Posted: Tue Jun 08, 2010 2:26 pm Post subject: |
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unclemack wrote:
I'm afraid I believe it may well be the result of a fungal attack some time ago.
Marks caused by fungus often follow streaks or wipe-marks left by a previous cleaning. Those interrupted streaks are characteristic.
I have an apo-ronar 480 here awaiting repolishing which has very similar markings. |
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