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Are they fungus?
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PostPosted: Mon Jul 13, 2015 8:36 pm    Post subject: Are they fungus? Reply with quote
Hi.

You can see a voigtlander lens. Skopar 4,5/105 perhaps from 1932/3.

It has fungus.

Are they cleanable?

Yes? How? With what?

Thanks.

http://mla-s2-p.mlstatic.com/objetivo-voigtlander-anastigmat-skopar-3914-MLA4882224441_082013-F.jpg


PostPosted: Mon Jul 13, 2015 10:02 pm    Post subject: Reply with quote
I think that would clean, quite easily as well. Of course, the rear elements aren't visible, but if they are no worse then I would dismantle and clean that lens.


PostPosted: Mon Jul 13, 2015 10:25 pm    Post subject: Reply with quote
Lloydy wrote:
I think that would clean, quite easily as well. Of course, the rear elements aren't visible, but if they are no worse then I would dismantle and clean that lens.


Thank you, Lloydy


PostPosted: Mon Jul 13, 2015 11:26 pm    Post subject: Reply with quote
Some people here recommend using cold cream (the stuff women use to remove makeup) to remove fungus. I've never tried it. I've been able to remove surface fungus just by rubbing on it really hard with my thumb (wash your hands first). Also lens tissue with lens cleaning fluid or alcohol, but very firm pressure is required here as well.

Give the exterior of your lens/shutter a good scrubbing, too. It needs it.


PostPosted: Mon Jul 13, 2015 11:33 pm    Post subject: Reply with quote
I use cold cream, it works well.


PostPosted: Mon Jul 13, 2015 11:44 pm    Post subject: Reply with quote
cooltouch wrote:
Some people here recommend using cold cream (the stuff women use to remove makeup) to remove fungus. I've never tried it. I've been able to remove surface fungus just by rubbing on it really hard with my thumb (wash your hands first). Also lens tissue with lens cleaning fluid or alcohol, but very firm pressure is required here as well.

Give the exterior of your lens/shutter a good scrubbing, too. It needs it.


I use distilled white vinegar. It's gentle, but kills the fungus. It also does not require heavy pressure, as you're described.

I use a q-tip, and work the vinegar across the whole surface. I then quickly breath on the surface and immediately use a lens tissue to mop things up. Breath on it again and use lens tissue until the streaks are gone, then distilled water with a lens tissue.

If the white vinegar dries, there will be streaks.

I've noticed that with much older, more fragile lens coatings, if the surface has been damaged by the fungus, the vinegar tends to highlight the damage.


PostPosted: Tue Jul 14, 2015 1:16 am    Post subject: Reply with quote
My anti-fungus treatment is a 1:1 mix of hydrogen peroxide and ammonia. It kills and cleans fungus and haze without a lot of hard rubbing. It hasn't failed me yet, and it is perfectly safe for coatings! I use the solution on a clean microfiber cloth.

P.


PostPosted: Wed Jul 15, 2015 10:15 am    Post subject: Reply with quote
dnas wrote:
I use distilled white vinegar. It's gentle, but kills the fungus. It also does not require heavy pressure, as you're described.

I use a q-tip, and work the vinegar across the whole surface. I then quickly breath on the surface and immediately use a lens tissue to mop things up. Breath on it again and use lens tissue until the streaks are gone, then distilled water with a lens tissue.

If the white vinegar dries, there will be streaks.

I've noticed that with much older, more fragile lens coatings, if the surface has been damaged by the fungus, the vinegar tends to highlight the damage.


Do not use any acidic cleaning solutions! There are types of glass in which one component gets dissolved by acids. The result will look like this:


Hydrogen peroxide on the other hand should work well, but is a pretty dangerous chemical. Especially if it get's in contact with your eyes or is inhaled. Therefore, I wouldn't recommend it. Isopropyl aclohol is safe, kills pretty much anything (it is the main ingeredient in surface disinfectant sprays) and would be my first choice. Ethanol works as well, but is often sold with lower purity and therefore tends to leave residues.

My final two wipes are always done with glass cleaner followd by a clean lintless wipe. That usually turns out perfect. If I suspect that some fungus spores survived in the lens body, I put it in a bucket and flood it with ozone for 4 hours. That deativates anything still "living" in the lens.


PostPosted: Wed Jul 15, 2015 10:24 am    Post subject: Reply with quote
I use windex.
works a treat. Smile
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