What oes a polarizer filter do?

Discussion in 'Photography Beginners' Forum' started by Boz Mon, May 5, 2008.

  1. Boz Mon

    Boz Mon TPF Noob!

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    What does it do, and do I need one? I currently dont have any filters for any of my lenses.
     
  2. Miaow

    Miaow TPF Noob!

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    I just got one of these but so far havent played around with it too much apart from taking a few water shots - but this is the uses from http://www.great-landscape-photography.com/polarizing-filter.html

     
  3. K8-90

    K8-90 TPF Noob!

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    Hmm. I was wondering about that too. Can you leave a polarizer on your lens? Or does it do funny things to other subjects?

    Oh. Another thing I think they can do is alow you to shoot subjects behind glass, right?
     
  4. Miaow

    Miaow TPF Noob!

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    Glass counts as a reflective surface in the above sense (what I quoted earlier) i'm pretty sure - The polariser is meant to knock out the reflections on it.
     
  5. HailttRedskins

    HailttRedskins TPF Noob!

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    It's a must have IMO, I tried to do a comparison image with it, maybe this will help you see the difference:

    [​IMG]
     
  6. abraxas

    abraxas No longer a newbie, moving up!

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    In landscapes the polarizer will also help cut hazy skies, blue them up and bring out clouds as well as subdue reflections. I leave mine on my d80 all the time- but I always use a tripod and almost always a shutter release.
     
  7. Garbz

    Garbz No longer a newbie, moving up!

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    It does funny things to all items that polarise light on reflection. Roads will go blacker, leaves will lose specular highlights, and skin will also lose specular highlights. In the right circumstance it can make a person look like they are made of clay.
     
  8. Ben-71

    Ben-71 TPF Noob!

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    To eliminate reflections from glass, the camera should point at an angle to the glass and not perpendicular to it.
    As for darkening the sky, the effect it the strongest when the sun is perpendicular to the lens, and diminishes gradually as the sun gets more & more in front - or behind - the lens, down to zero effect when the sun is in front or behind the lens.
    When the sun is low, the sky will be bright at the sun side, and very dark at the other side.
    With a very wide lens, the polarizing effect will be only at part of the pic' (or part of the sky), which typically looks bad.
    As the Pol. Filter is rotated for tuning, it is a nuisance on lenses in which the front rotates.
    It reduces light, so many times it can also be used as a ND filter.
    For the same reason, you constantly lose 1~1.5 stops if you leave it on the lens all the time.
    Many (yours truly included), regard the Polarizing and the UV or Skylight filters as the 2 basic filters.
     
  9. Mav

    Mav TPF Noob!

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    1) without CP
    [​IMG]

    1) WITH CP
    [​IMG]



    2) without CP
    [​IMG]

    2) WITH CP
    [​IMG]



    3) without CP
    [​IMG]

    3) WITH CP
    [​IMG]



    4) without CP
    [​IMG]

    4) WITH CP
    [​IMG]


    misc with CP
    [​IMG]


    misc with CP
    [​IMG]
     
  10. asfixiate

    asfixiate TPF Noob!

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    Great examples!
     
  11. K8-90

    K8-90 TPF Noob!

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    Wow, really? How does that happen?
     
  12. K8-90

    K8-90 TPF Noob!

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    The first two sound like benefits, but i don't know if I want people looking like clay!
     

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