Polarizer!! HOW?

Discussion in 'Beyond the Basics' started by hao, Oct 16, 2009.

  1. hao

    hao TPF Noob!

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    I heard that when using a polarizer, you should not aim your camera to the sky and adjust your CPL to get the darkest sky (it is what I have been doing). What you should do is to look at something with reflection and rotate your CPL to minimize the reflection from the subject. How do you use it? What I dont get is why cannot you just get a dark sky in the viewfinder, which will turn out to be a very blue sky in the image. Someone said it is wrong. But I dont know why.

    The other thing is that when using CPL, why do you do a negative exposure compensation? I assume you are metering with the CPL on the lens, and the CPL already darkens what the camera sees, so you should get a correct metering reading for the CPL-added scene. It is mentioned here in this video:


    If anyone can provide a very good source illustrating how to correctly use a CPL, that would be also very appreciated. ;)

    Thanks for reading my questions and your input.
     
    Last edited by a moderator: Sep 11, 2014
  2. Garbz

    Garbz No longer a newbie, moving up!

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    NO what you should do is point the camera at the subject and adjust the polariser to make the image look like YOU want it to. If someone ever tells you how to use a polariser, punch them in the face.

    Same with exposure compensation. I didn't watch the video, but does your image come up over exposed? If not and some guy tells you to underexpose it recommence the punching.


    Nothing annoys me more than someone showing me an image that looks like crap, they don't like it themselves, and then saying oh but I was TOLD this is what to do.
     
  3. Plato

    Plato TPF Noob!

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    1) You can use a polarizer to darken the sky if you wish.

    2) You can use a polarizer to eliminate reflections if you wish.

    3) If you're using the correct polarizer for modern SLRs, i.e. a circular polarizer, there is no need for you to do any exposure compensation unless you want the photo deliberately darker or lighter than "normal." The camera will read the exposure properly. If you happen to have an old linear polarizer, this response is out the window and your autofocus might also get messed up.

    4) I agree with the points that Garbz made.
     
  4. Dwig

    Dwig TPF Noob!

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    Correct.

    Before you decide how to use a polarizer, but must decide why you are using a polarizer. If you can't decide why then you can't determine how so you should leave it in your bag and shoot without it. Its your decision, and only your decision, why.
     
  5. Plato

    Plato TPF Noob!

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    Good point.
     
  6. tirediron

    tirediron Watch the Birdy! Staff Member Supporting Member

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    A quick and dirty on CPOLs: Compensation is NOT required. Meter with the filter on the lens; you'll lose between one and two stops of light depending on the filter. To gain the maximum effect, remember that the sun should be lower in the sky (early morning/later afternoon) and at ninety degrees to the lens axis.
     
  7. hao

    hao TPF Noob!

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    thanks for your comments everybody:thumbup:
     

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