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Thread: polarizers

  1. #1
    Member
    Join Date
    May 2002
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    Default polarizers

    i am not sure what is the difference between
    PL (Linear Polarising) and PL-CIR (Circular Polarising)

    .....
    The HOYA website said it depends on the user's camera...
    i own a D30..

    please advise
    thanks
    Regards, Mark Pang
    www.markpangphotography.com

  2. #2

    Default

    Quote Originally Posted by haagen_dazs
    i am not sure what is the difference between
    PL (Linear Polarising) and PL-CIR (Circular Polarising)

    .....
    The HOYA website said it depends on the user's camera...
    i own a D30..

    please advise
    thanks
    Hoya catalogue gave the following advice :

    How to select the correct Polarising filter;
    Many of today's cameras use semi-silvered mirrors or prisms to split the light entering the viewfinder in order to calculate exposure and focusing distance. PL (Linear Polarising) filters can sometimes interact with these items to give unpredictable exposure or focusing. So we recommend that you choose a PL-CIR filter unless you have a manual docus camera which has no beam splitter.

  3. #3
    Member
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    Apr 2004
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    in the shadow of the tallest hill in S'pore!
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    Default

    Quote Originally Posted by haagen_dazs
    i am not sure what is the difference between
    PL (Linear Polarising) and PL-CIR (Circular Polarising)

    .....
    The HOYA website said it depends on the user's camera...
    i own a D30..

    please advise
    thanks
    Hi Haagen Daz...

    If I'm not wrong, the use of Pl interferes with the AF of some cameras. I'm not sure about the D30. Personally, I'm using the D30 with PL-CIR on the lenses.

    Cheers.=)

  4. #4

    Default

    Circular polarizer works well with AF cameras.

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