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Lens with an etched surface - could it be recovered?
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PostPosted: Mon Nov 24, 2014 8:54 pm    Post subject: Lens with an etched surface - could it be recovered? Reply with quote
I've just got a Schneider Kreuznach 40mm f3.5 D Claron with the front lens having, as the seller described it, a "surface contamination".
Under a close examination with a 16x magnifier it proved to be an etched surface - tens of very small, almost microscopical pits. I don't know what could produce that but it wasn't fungus - they don't have a fungus pattern. I can't blame the seller as he mentioned the "surface contamination".
My question is: could it be restored? Re-polishing is not an option - it costs way too much. I'm thinking of something like applying a thin layer of Canadian Balsam (I still have some) or something similar.


PostPosted: Mon Nov 24, 2014 10:15 pm    Post subject: Reply with quote
Hmm, difficult one. I had a Macro lens once that showed similar, but I had the front lens replaced.
Car Glass has a window shield repair shop and they use a UV hardening crystal clear resin, which is afterwards then polished. Maybe something like this would do?

But honestly even the smallest change in the front curvature of the lens has quite some impact (aspherics were made using this method), so I doubt it can be rescued....


PostPosted: Mon Nov 24, 2014 10:37 pm    Post subject: Reply with quote
Someone gave me a pack of 'Lens CPR' which is advertised as a repair for scratched glasses. And I was going to try it on a lens....but then I read the customer reviews on Amazon. Rolling Eyes

http://www.amazon.com/Lens-CPR-Doctor-Scratched-Glasses/dp/B000AJGP1E

but, could this type of thing be worth experimenting with? Phil suggested a similar product for repairing scratched CD's, it's possibly the same stuff?


PostPosted: Mon Nov 24, 2014 11:41 pm    Post subject: Reply with quote
I bought a CD scratch kit from the pound shop it contains polyacrylic and uric acid (twice today that word came out). Its good for filling fine scratches in polycarbonate i.e CD's and acrylic spectacles. But glass lenses - I'm not sure. Worth a go though. Nothing to lose.

Thanks for reminding me Dave, I have a Rokkor 50mm f1.4 thats almost useless. I'll give that a go with it.

The item I can get is something like this Click here to see on Ebay


PostPosted: Tue Nov 25, 2014 12:54 am    Post subject: Reply with quote
I'll have a go with this stuff I've got, I'm sure I have some old Canon AF lenses somewhere. Laughing
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