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  1. #21
    Join Date
    Oct 2013
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    Near Bicester, Oxon
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    Default Re: Polaroid Glasses with reactive lenses

    Quote Originally Posted by Secret Angler View Post
    I stipulated unpolarised, in which case half the light is blocked. You can read about it here if you like:
    Polarization

    So quite how a photochromic lens works with polarised is unclear to me.

    The Secret Angler – Commentary on angling – saying the things no one else dares to say
    Can you explain the 50% statistic please? What if more light is aligned in one plane than another?
    Last edited by bonefishblues; 08-01-2019 at 08:49 PM.

  2. #22

    Default Re: Polaroid Glasses with reactive lenses

    Secret Angler, yes - take a look on ebay...

  3. #23

    Default Re: Polaroid Glasses with reactive lenses

    Quote Originally Posted by bonefishblues View Post
    Can you explain the 50% statistic please? What if more light is aligned in one plane than another?
    Unpolarised light is unaligned - ie. a random spread. It's a little tricky to understand if you are not used to thinking in terms of components, but all the bits aligned against the sunglass's polarisation direction will go, and on average this is half the incident light.

    For us anglers the partial polarisation of relflected light is the most important thing.

    The Secret Angler – Commentary on angling – saying the things no one else dares to say
    Last edited by Secret Angler; 12-01-2019 at 04:09 PM.
    secretangler.home.blog

  4. #24

    Default Re: Polaroid Glasses with reactive lenses

    Quote Originally Posted by arkle View Post
    Secret Angler, yes - take a look on ebay...
    Found them. Presumably they start at 50% reduction and darken further. I wonder how dark they get.
    secretangler.home.blog

  5. #25
    Join Date
    Oct 2013
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    Near Bicester, Oxon
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    2,774

    Default Re: Polaroid Glasses with reactive lenses

    Quote Originally Posted by Secret Angler View Post
    Unpolarised light is unaligned - ie. a random spread. It's a little tricky to understand if you are not used to thinking in terms of components, but all the bits aligned against the sunglass's polarisation direction will go, and on average this is half the incident light.

    For us anglers the partial polarisation of relflected light is the most important thing.

    The Secret Angler – Commentary on angling – saying the things no one else dares to say
    So it's an average and could be higher or lower, depending on the precise alignment of the rays being presented to the polarising filter. Is that correct?

  6. #26

    Default Re: Polaroid Glasses with reactive lenses

    Quote Originally Posted by bonefishblues View Post
    So it's an average and could be higher or lower, depending on the precise alignment of the rays being presented to the polarising filter. Is that correct?
    No, it will always be 50% (in natural light), unless you set up something with a narrow slit in a darkroom. It's an average in the sense that air pressure on you is an average - i.e. the molecules never conspire to knock you over. Sorry, not easy to explain in a post.

    The Secret Angler – Commentary on angling – saying the things no one else dares to say
    secretangler.home.blog

  7. #27

    Default Re: Polaroid Glasses with reactive lenses

    The ones I bought, seem to have a more limited strata than those without the polarization. However to try & get a seller to quote figures maybe challenging, especially at the low-ish price points. As there are so many different ones on the market, I think you'll find it's very much pot-luck & the lenses may only come from a limited number of suppliers who are probably unknown to the sellers anyway.

  8. #28
    Join Date
    Oct 2013
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    Near Bicester, Oxon
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    2,774

    Default Re: Polaroid Glasses with reactive lenses

    Quote Originally Posted by Secret Angler View Post
    No, it will always be 50% (in natural light), unless you set up something with a narrow slit in a darkroom. It's an average in the sense that air pressure on you is an average - i.e. the molecules never conspire to knock you over. Sorry, not easy to explain in a post.

    The Secret Angler – Commentary on angling – saying the things no one else dares to say
    Have done some further reading and conceptually you're right, given a perfect polarising layer. In practice, because all are flawed it won't be quite that. I also read some dark mutterings about new technology which would give both highly effective polarisation with very high light transmission, but things got way too technical for me!

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