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Thread: RE: Schneideritis

  1. #11

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    Re: Schneideritis

    Quote Originally Posted by Greg View Post
    OK... so how much does the seeming ever present to some degree Schneideritis to (older?) Schneider lenses effect their performance? Rodenstockitis, Zeissitis, and Nikkoritis seem to never be mentioned.

    I've used (and still use) several vintage lenses with plenty of xxxxitis, subjectively without effecting the images they throw. Most of my exposures made a f/45 and f/64.... is the effect of Schneideritis less felt at these small apertures?
    The black paint inside the lens is intended to reduce stray light in some conditions. If white paint was used instead black you would notice an increase of stray light (non image forming light). At the end the dots from schneideritis have an small total surface, so no increase in stray light can be noticed. If a large share of the inner surface was peeled off, sun was not in the framming but still bathing the glass, and no lens hood was used... then some increase of stray light would be noticed.

  2. #12
    Jac@stafford.net's Avatar
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    Re: Schneideritis

    I have read the rationales and justifications for Schneideritis for decades and regardless I cannot fathom how they let it proliferate for so long. If it causes no harm, then why didn't other makers allow Schneideritis in order to make manufacturing cheaper? And has anyone compared a fair sample of Schneider lenses with and without Schneideritis? I think not.

    To me it is a shame. WTF?

  3. #13
    Andy Eads
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    Re: Schneideritis

    I've pulled a few bargain Schneider lenses apart to clean them up. What I found was the black paint isn't paint but a stretchy coating. I suspect the coating eventually develops small holes where it contacts a sharp spot on the glass edge. As said in earlier posts, the holes are very small areas and likely have no discernable effect on the image. I suspect Schneider didn't do anything about the problem because it had no effect and the holes are just that, holes and not flakes. I brushed the old Kodak "Brushing Black" lacquer over the spots to make the lenses appear perfect. - Andy

  4. #14
    Jac@stafford.net's Avatar
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    Re: Schneideritis

    Quote Originally Posted by Andy Eads View Post
    I suspect Schneider didn't do anything about the problem because it had no effect and the holes are just that, holes and not flakes.
    I suspect that Schneider has gone into automatic mode with no engineers on staff. The production 'bots are taking orders from the bean counters.
    .

  5. #15
    Randy's Avatar
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    Re: Schneideritis

    It's best to never store an affected lens near a non affected lenses, as it does spread.
    https://dl.dropboxusercontent.com/u/52893762/bigger4b.jpg

  6. #16

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    Re: Schneideritis

    And then the result may be a tiny Rod Schneiditis :-)

  7. #17

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    Re: Schneideritis

    Quote Originally Posted by Randy View Post
    It's best to never store an affected lens near a non affected lenses, as it does spread.
    Randy, IMHO this is for fungus affected lenses, fungus do spread. A lens with fungus needs desinfectation.

    IMHO Schneideritis is simply the black paint separating from the walls, and this is not contagious.

  8. #18

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    Re: Schneideritis

    Just as you can't cure a fungal infection with an antibiotic, you first treat inflammation, an "-ITIS", with an anti-inflammatory drug, such as Ibuprofen, or in extreme cases, a steroid. Then after determining the cause of the inflammation, you can select an appropriate cure -- from a plaster cast to some black paint.

  9. #19

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    Re: Schneideritis

    Apply a little India ink over the afflicted area if is on an edge of an element... Thinner than paint...

    Steve K

  10. #20

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    Re: Schneideritis

    Regarding "Schneideritis", no fungus comes in play.
    Real Schneideritis seems to be a bit more than only missig some colour.
    What I have seen are spots between the colour (which seems to be , as said before, more a coating than a painting) and the glass, but the coatings themselves has been fine.
    This eventually means that this coating reacts in anyway with the glass over the time.
    This further may result in real spots in the coating.

    Once I had to open an Angulon with rattling lenscells, and this are some impressions from inside:

    Click image for larger version. 

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    Click image for larger version. 

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    So far, and well known, too.
    But in looking from another perspective, I would not say that Schneideritis isn't causing problems in some cases:
    Click image for larger version. 

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    Sorry for the lack of sharpness there..

    Unfortunately the client didn't want me uncoating and restoring the black coating, and he has not tried this lens after my "CLA"- but I really expect some problems and a second opening of the Angulon.

    Ritchie

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