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  1. #11
    benjiboy's Avatar
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    I suggest you read this thread http://nortega.com/fastest-tool-to-c...horium-lenses/ I cleared the yellow caste in my canon FD 35mm f2 Thorium lens with one of these in about thirty hours http://www.ikea.com/us/en/catalog/products/20169658/ you can point it right down into the lens and it removed the yellow tinge like magic and because it's L.E.D and they produce U.V light but it produces very little heat, my lens is now completely clear, and it's also a very useful work light.
    Last edited by benjiboy; 09-03-2012 at 03:41 PM. Click to view previous post history.
    Ben

  2. #12
    Chrismat's Avatar
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    This last post is great, I'm definitely going to keep that in mind in case I get another yellowed lens or the Takumar 1.4 I have no yellows again. Thanks benjiboy!

    Chris

    http://www.flickr.com/photos/chrismat61/

  3. #13
    benjiboy's Avatar
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    Quote Originally Posted by Chrismat View Post
    This last post is great, I'm definitely going to keep that in mind in case I get another yellowed lens or the Takumar 1.4 I have no yellows again. Thanks benjiboy!

    Chris

    http://www.flickr.com/photos/chrismat61/
    These lenses go yellow because they contain Thorium salts and are mildly radioactive so might consider also getting some lead lined boxer shorts too
    Ben

  4. #14

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    The UV-A reptile lamp I mentioned a couple posts ago doesn't produce much heat at all. It's not a heat lamp. I had the lens under the lamp for ten days and it never got warm to the touch. It only cost me $9.00 and completely cleared the lens.

  5. #15
    Uncle Bill's Avatar
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    Quote Originally Posted by benjiboy View Post
    I suggest you read this thread http://nortega.com/fastest-tool-to-c...horium-lenses/ I cleared the yellow caste in my canon FD 35mm f2 Thorium lens with one of these in about thirty hours http://www.ikea.com/us/en/catalog/products/20169658/ you can point it right down into the lens and it removed the yellow tinge like magic and because it's L.E.D and they produce U.V light but it produces very little heat, my lens is now completely clear, and it's also a very useful work light.
    I got two lenses a M-42 50 f1.4 and an early 35 F2 FD lens that need the UV treatment, the desk lamp looks to be the most effective solution. I got too much shade around my house.
    "Life moves pretty fast, if you don't stop and look around once and a while, you might just miss it."
    Ferris Bueller

  6. #16
    benjiboy's Avatar
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    The Ikea Jansjo lamp's neck is so flexible Bill I was able to put the head almost touching the rear element of my FD 35mm f2 lens that I placed on a small mirror to maximize the effect, and it worked like a charm, in fact every time I look at the lens now I can't believe it, I shot some Fuji Provia with it to test it and I projected it and can see no colour caste at all.
    Interestingly my eldest son who's a nuclear physicist told me that the yellow caste will eventually come back, but not in my lifetime
    Ben

  7. #17
    benjiboy's Avatar
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    [QUOTE=Chrismat;1389092]This last post is great, I'm definitely going to keep that in mind in case I get another yellowed lens or the Takumar 1.4 I have no yellows again. Thanks benjiboy!

    Chris ,
    Watch this link I think it proves it definitely works http://www.youtube.com/watch?v=3CAaSgK6WsE
    Ben

  8. #18
    Uncle Bill's Avatar
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    Quote Originally Posted by benjiboy View Post
    The Ikea Jansjo lamp's neck is so flexible Bill I was able to put the head almost touching the rear element of my FD 35mm f2 lens that I placed on a small mirror to maximize the effect, and it worked like a charm, in fact every time I look at the lens now I can't believe it, I shot some Fuji Provia with it to test it and I projected it and can see no colour caste at all.
    Interestingly my eldest son who's a nuclear physicist told me that the yellow caste will eventually come back, but not in my lifetime
    I'm stopping by Ikea on the way home to pick one of those lamps up this afternoon.
    "Life moves pretty fast, if you don't stop and look around once and a while, you might just miss it."
    Ferris Bueller

  9. #19
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    Quote Originally Posted by Uncle Bill View Post
    I'm stopping by Ikea on the way home to pick one of those lamps up this afternoon.
    Please let me know if it works for you Bill.
    Ben

  10. #20

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    benjiboy,
    Thanks for the great tip! I'm getting one right away.
    2bits

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