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Thread: Circular polarizer help

  1. #1

    Default Circular polarizer help

    Hi all, I just bought a Hoya CPL, I found that the image turn out to be darker then the normal, may I know what is the recommended camera setting when we use this filter? such as +0.3EV? Or is there any good resources to teach us how to use CPL? Thanks.

  2. #2

    Default Re: Circular polarizer help

    Ok guys, I just found a nice website for using CPL:

    http://www.cs.mtu.edu/~shene/DigiCam...polarizer.html

    Happy shooting.

  3. #3

    Default Re: Circular polarizer help

    Thank you for asking and also sharing the article.

  4. #4
    Senior Member +evenstar's Avatar
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    Default Re: Circular polarizer help

    no need to adjust EV since exposure sensor is inside the camera
    eat. drink. shoot

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    Default Re: Circular polarizer help

    Quote Originally Posted by +evenstar
    no need to adjust EV since exposure sensor is inside the camera
    Wah seh, then I wonder why they put the EV control into the camera for?

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    Default Re: Circular polarizer help

    A polarizer has two rings. The bottom ring screws on to the front thread of a lens, and the top ring is rotatable. As the top ring rotates, one can see the effect through the LCD monitor.
    this is taken from the article from the threadstarter. then DSLRs ...u gotta take a few times to compare the effects? i know it sounds stupid, but is there a more effective way of viewing the polariser effect?

    i also noticed from my polarisers, they rotate, yes. but i dun really understand how the markings work. my hoyas hv a white strip, kenkos hv a white arrow.

    if this has been discussed before, then nvm. thanks.

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    Default Re: Circular polarizer help

    Quote Originally Posted by niki
    this is taken from the article from the threadstarter. then DSLRs ...u gotta take a few times to compare the effects? i know it sounds stupid, but is there a more effective way of viewing the polariser effect?

    i also noticed from my polarisers, they rotate, yes. but i dun really understand how the markings work. my hoyas hv a white strip, kenkos hv a white arrow.

    if this has been discussed before, then nvm. thanks.
    I use the white strip as an indicator of where to start by turning it towards the sun.
    Then I adjust by rotating the outer ring until reflections are gone or colour/contrast is to my satisfaction, viewing through the viewfinder.

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    Default Re: Circular polarizer help

    mariner,

    r u using a p&s? thanks for ur reply

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    Default Re: Circular polarizer help

    Quote Originally Posted by niki
    mariner,

    r u using a p&s? thanks for ur reply
    I started with a P&S but only used polarizers and other filters when I got my prosumer.
    Now I use a SLR/dSLR more.

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    Default Re: Circular polarizer help

    i'm using a dslr.. when when i rotate, i dun see any diff... so i assume i gotta take the pics 1st b4 seeing them?

  11. #11

    Default Re: Circular polarizer help

    i also wonder why it has to be rotating since the matte pattern is radial. no point in rotating isnt it? unless it's axial.

  12. #12
    Senior Member +evenstar's Avatar
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    Default Re: Circular polarizer help

    Quote Originally Posted by niki
    i'm using a dslr.. when when i rotate, i dun see any diff... so i assume i gotta take the pics 1st b4 seeing them?
    nope, the effect can be seen through the VF...try it on your LCD screen/TV/watch/calculator/etc and you'll see the effect..
    eat. drink. shoot

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    Default Re: Circular polarizer help

    thanks evenstar

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    Default Re: Circular polarizer help

    Quote Originally Posted by niki
    i'm using a dslr.. when when i rotate, i dun see any diff... so i assume i gotta take the pics 1st b4 seeing them?
    Note the angle of light you're cutting off at, certain angles you cannot see anything. Best recommended angle is 90 degrees from the sun.

    Also the type of CPL used does matter. Certain types like Hoya or the cheapo ones serve only to use as a ND filter more than a CPL, so no matter how you turn, you can't see sh!t.

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    Default Re: Circular polarizer help

    Quote Originally Posted by AncientMariner
    I use the white strip as an indicator of where to start by turning it towards the sun.
    Then I adjust by rotating the outer ring until reflections are gone or colour/contrast is to my satisfaction, viewing through the viewfinder.
    And, IIRC, try to put the sun behind you for greater blue skylight effect. That's mean it is better to take photos in the morning or afternoon (not when the sun on your top).

    Regards,
    Arto.

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    Senior Member jnet6's Avatar
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    Default Re: Circular polarizer help

    Quote Originally Posted by DeWei
    Hi all, I just bought a Hoya CPL, I found that the image turn out to be darker then the normal, may I know what is the recommended camera setting when we use this filter? such as +0.3EV? Or is there any good resources to teach us how to use CPL? Thanks.
    your camera metering will automatic adjust to get it's exposure.

  17. #17

    Default Re: Circular polarizer help

    Quote Originally Posted by jnet6
    your camera metering will automatic adjust to get it's exposure.

    But I consistently get darker images, but if I set to +0.3EV, then it should be alright.

  18. #18
    Senior Member jnet6's Avatar
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    Default Re: Circular polarizer help

    Quote Originally Posted by DeWei
    But I consistently get darker images, but if I set to +0.3EV, then it should be alright.
    if i'm not wrong may due to the colour casting for the CP...
    which may give a darker look.

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    Default Re: Circular polarizer help

    Quote Originally Posted by Artosoft
    And, IIRC, try to put the sun behind you for greater blue skylight effect. That's mean it is better to take photos in the morning or afternoon (not when the sun on your top).

    Regards,
    Arto.
    Actually, with the sun behind you the polarizer has minimal, if not nil, effect.
    Why people prefer to shoot during the 2 hours after sunrise and before sunset is it offers good lighting conditions because the lighting is more diffused and less harsh and not because of any reason related to using polarizers.

  20. #20
    Senior Member jOhO's Avatar
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    Default Re: Circular polarizer help

    Quote Originally Posted by Artosoft
    And, IIRC, try to put the sun behind you for greater blue skylight effect. That's mean it is better to take photos in the morning or afternoon (not when the sun on your top).

    Regards,
    Arto.
    as espn said, it's 90 degrees (on the same plane) from the sun, not 180 degrees (sun behind you).

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