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Thread: New Coatings eliminating Newtons Ring

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    Idea New Coatings eliminating Newtons Ring

    Wondering if any of you have heard of the new antireflection coating called CHIC. That name is more likely a certain product name but the effect is different indexies of refraction for the different indexies of AR coated lenses. It states it eliminates the Newton Ring that is noted in anything over a 1.56 index presently.
    Just curious as it is something new our private lab has brought to our attention.
    Thanks!!!!

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    OptiBoard Professional RT's Avatar
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    HOYA has been producing substrate matched AR coatings for over a decade.
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    it depend of the type of light....

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    I'm confused. I thought the AR coating had to relatively match the substrate to be effective... why would this be new technology? Am I wrong?

    Quick edit/addition: Why are we talking about Newton's rings? In what situation would we care about that?

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    Try with a neon lighting (I'm not sure for the translation !)

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    Master OptiBoarder OptiBoard Gold Supporter DragonLensmanWV's Avatar
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    Quote Originally Posted by musicvirtuoso View Post
    I'm confused. I thought the AR coating had to relatively match the substrate to be effective... why would this be new technology? Am I wrong?

    Quick edit/addition: Why are we talking about Newton's rings? In what situation would we care about that?

    Look at a CR-39 with AR under fluorescent lighting. Notice how even the reflex is? Now look at a poly or 1.67 or higher index with AR (not Hoya) under the same conditions and you will see what they mean. You will see rings in the AR.
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    Quote Originally Posted by DragonLensmanWV View Post
    Look at a CR-39 with AR under fluorescent lighting. Notice how even the reflex is? Now look at a poly or 1.67 or higher index with AR (not Hoya) under the same conditions and you will see what they mean. You will see rings in the AR.
    That is exactly that I wanted to say !
    Thank you.

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    Master OptiBoarder OptiBoard Gold Supporter Judy Canty's Avatar
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    Why is this an issue if it's only visible in specific light conditions? Does it compromise vision? Or is it another way to pimp a new AR?

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    Master OptiBoarder OptiBoard Gold Supporter DragonLensmanWV's Avatar
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    It's really visible under any type of light. Just more noticeable under fluorescent lights. It comes from the AR coating's index not matching closely enough the index of the substrate. Heck you can even see it with non-AR lenses, like stock poly.
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    OptiBoard Professional Mauro.Airoldi's Avatar
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    sorry but i'm a little confused, The trouble of the Newton ring... is not connected with the AR propety, the max thickness in a AR layer is 100-120 nanometer, not enough to create the effect.
    The troubles are acused from the difference of index betwen lens and had coat layer (it is 2-4 micron).
    NO AR modification can solved it , the confermation of this thing is that we have Newton ring in lens only HC.
    The only way is use HC layer with the same index of the substrate (it is OK if the difference is less of 0.03).
    We have to consider that the HC with index arround 1.50 is the less expensive and hight HC we use the price go Higt (a good 1.6 HC is +/- 2.5 time the 1.5).
    For the mass productions the main productor use a specific HC for every lens index but for prescriptions lens the laboratory can't manage 4-5 different HC (tintabe and not tintable), the standard for the best laboratory is use 1.5 tinatabe, 1.5 not tintable and 1.6 not tintable.

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