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Posted on May 04, 2008
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SCHNEIDER SYMAR-S 210MM 1:5.6 LARGE FORMAT VIEW LENS

Well that is close. Problem is white spots on the surface of the black coating around the perimeter of the front lens. I have the front lens out of the assembly. The coating looks fine on the outside but looking through the lens I see a lot of white spots on the black coating.
I am told it is called the Schneider effect.
Can it be fixed? I do have a picture of the spots.
Kind Regards
Ed Moon [email protected]

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Hello aPaulK.

The phenomenon is due to voids/defects in the paint on the edge of the lens. Although the spots will not affect your image, it could be corrected. This is more of a cosmetic rather than a functional problem. The repair will require disassembly and removal of all elements, stripping the old black edge paint, repaint the element edges and reassemble/adjust all functions. Repainting involves applying a good adhereing opaque black paint to the angled ground edge of the element. This is done at the factory by skilled workers using a potters wheel sort of thing and applying the paint with a brush as the element is spun at about 100 rpm. It takes a lot of practice to get this right and its not a simple matter of "what's the secret paint?"

If you do manage to disassemble the piece, you can clean the lens with methylated spirit, which can remove the fungal growth, if present..

Hope that helps! Should you have any further questions, please feel free to post them here.

P.S. - If you find that the solution/answer I provided led you to, or resulted in a fix, please close the ticket with a FixYa! rating. I would be very grateful for your show of appreciation.
If it hasn’t, please do not assign a rating just yet. Please post back as to what steps you took, results, etc, and I will try to assist you further as best I can. I am here at your service.

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Cheers!
IrishDruid

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  • Posted on May 04, 2008
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  • Anonymous May 04, 2008

    else it must be cleaned using some cleaning solution..

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