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Chris
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 27, 2004 - 08:11 am: | 
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I have a number of old German lenses (Steinheil, Schacht, Meyer...) which typically develop a slightly reticulated "mottling" on some coating surfaces, which in practice acts as a haze.
It is not fungus, and it tends to affect the whole surface. No solvent or cleaner I've tried will get it off.
The only "success" I've had is putting elements through a dishwasher (honest!); this effectively removes the entire coating.
Any suggestions are welcome.
Chris |
Ed
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 27, 2004 - 10:06 am: |
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you say on coated surfaces--are these, in fact, coated lenses. If not, you might ry polishing with toothpaste and something called Symchrome--not sure about the speeling, but it is a plastics polish--comes in a tube--prbably available from hobby stores. Another thought is this stuff affecting pics? |
Andrew
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 27, 2004 - 10:58 am: |
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Be careful running the rear element of a Tessar, Skopar, or Solinar through a dishwasher. The rear element is really a group, in this case a cemented doublet. I'm not too sure when the industry switched from Canadian basalm to modern cements. |
David Nebenzahl
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 27, 2004 - 11:51 am: |
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I'm assuming these lenses are uncoated, right? If so, you were on the right track by using a dishwasher: a strong, non-abrasive cleaner (heat doesn't hurt, either, to speed the reaction).
Please, please, please ignore that suggestion to use toothpaste, chrome polish, anything that is abrasive. Unless you're an expert at regrinding lenses, you're flirting with disaster. (Guess how I know this.)
One thing I've used with success (on uncoated lenses only) is soaking the lenses in a strong solution of TSP (tri-sodium phosphate). This will take off as much of the haze you describe as is possible. |
John Larson
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 12, 2004 - 10:35 am: |
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This is essentially a natural 'coating', it happens to uncoated lenses an was actually a good thing in the early days. If your lenses are uncoated, don't wash it off.
And seconded, DON'T USE ABRASIVES ON LENSES. |
John Larson
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 12, 2004 - 10:42 am: |
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This may help?
http://medfmt.8k.com/bronfaultsp.html |
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