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Thread: Lens coating removal question

  1. #21

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    Re: Lens coating removal question

    Kool!!! Report back with what kind of images this monster makes...

    Steve K

  2. #22

    Join Date
    Dec 2018
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    991

    Re: Lens coating removal question

    A quick phone shot of the ground glass.
    Some semi- backlit leaves. Had to use hand as a lens shade. Wide open. Pretty flarey...will try again under more controlled circumstances.Attachment 203732

  3. #23

    Join Date
    Dec 2001
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    San Joaquin Valley, California
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    9,599

    Re: Lens coating removal question

    I was camped out somewhere above Soldier Meadow in the Sierra and my Commercial Ektar needed cleaning.
    All I had was Vodka.
    That did a number on the coating IIRC,
    "I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority"---EB White

  4. #24

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    May 2015
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    Re: Lens coating removal question

    Quote Originally Posted by Dugan View Post
    A quick phone shot of the ground glass.
    Some semi- backlit leaves. Had to use hand as a lens shade. Wide open. Pretty flarey...will try again under more controlled circumstances.Attachment 203732
    I think you are on to something there... More!!!

    Steve K

  5. #25

    Join Date
    Nov 2006
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    218

    Re: Lens coating removal question

    Quote Originally Posted by LabRat View Post
    I think it was Focal Point that would polish off coatings before re-coating...

    Modern coatings are harder, but older "hard" coatings are softer than today...

    I was told the finest abrasive is cesium oxide, but don't know where to get it... Jeweler's Rouge is available, and is used to polish glass... But power polishing is not recommended as it builds heat unevenly (and can crack glass), but a glass guy told me lots and lots of hand polishing will work (eventually)...
    Cerium oxide, not cesium oxide!

    It is readily available, used by those who polish lenses for homebuilt telescopes. I’ve used this successfully to bring life back on lenses with otherwise un-cleanable haze

  6. #26

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    Re: Lens coating removal question

    Quote Originally Posted by Tim Deming View Post
    Cerium oxide, not cesium oxide!

    It is readily available, used by those who polish lenses for homebuilt telescopes. I’ve used this successfully to bring life back on lenses with otherwise un-cleanable haze
    Correct!!! Cesium oxide would glow in the dark...

    Thanks,

    Steve K

  7. #27

    Join Date
    Aug 2005
    Location
    Illinois
    Posts
    49

    Re: Lens coating removal question

    I was told the finest abrasive is cesium oxide, but don't know where to get it... Jeweler's Rouge is available, and is used to polish glass... But power polishing is not recommended as it builds heat unevenly (and can crack glass), but a glass guy told me lots and lots of hand polishing will work (eventually)...
    I think he probably said "Cerium Oxide" which is a fairly common fine grit polishing compound. Check amazon here: https://www.amazon.com/Cerium-Glass-.../dp/B004QJN98Q

  8. #28

    Join Date
    Dec 2018
    Posts
    991

    Re: Lens coating removal question

    Hi, thanks for clearing that up.
    I have given up trying to clean the lens element, it is micro-pitted, and not worth putting much effort into it.
    Using thin superglue, as per LabRat, did knock down some of the haze and brought back some contrast. The lens has a new life as a portrait lens.

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