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Thread: Arcing on Ar coated Lenses

  1. #1
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    Arcing on Ar coated Lenses

    Hello All,

    Could anyone tell me what is Arcing on lenses and what is the cause for this happening on Ar lenses? Are these fine lines like cracks when you look at the lens? Does it happen because of the hard coat or is it because of the AR coat. Tell me what Arcing means.

    Thanks in Advance guys

  2. #2
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    Mine happened when I left them on the dash of my car when I went fishing. I had a number of people who had this occur after burning limbs after we had five tornados in town in one day.
    Others it occured on car trips in air conditioned cars (not left in car) over a few days.
    Some happened after months of wear, others after very short time. Some for no appearent reason.
    I would really be interested if this is more prevailent in certian regions of the country, the if climate (not global warming for God's sake) conditions or perhaps particular coating labs.

    Chip

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    Arcing

    Thanks for the answer chip.......can you explain what arcing looks like? Is it small kind of semi-circular cracks?

  4. #4
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    Arcing on lenses ?

    That's interesting, here a shortened extract from Wikepedia:

    The various shapes of electric arc are emergent properties of nonlinear patterns of current and electric field. The arc occurs in the gas-filled space between two conductive electrodes and it results in a very high temperature. An electric arc is a continuous discharge, while a similar electric spark discharge is momentary.

    Arcing can theoretically happen in certain process steps during lens manufacturing, but hardly by accident or coincidence afterwards (..on a dashboard..) .

    Lensman, the way you aks let's me think you have this problem only in combination with Hard Coat and AR coat, is that right ?
    Then you should really focus your attention to lens surface preparation before Hard Coat.

    Chip & Lensman, could you let us know where you picked this up and how this manifests i.e. looks like, what are we talking about?
    I don't think you are talking about the same thing.


    Georg Mayer
    Better Best then Biggest

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