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Thread: Metering with Polarizer filters

  1. #1

    Metering with Polarizer filters

    Has anyone established a good way to know in advance exactly how much exposure compensation is necessary using a polarizer at various settings?

    I do not have behind the lens metering.

    The thought occurred to me that I might be able to pre-caliberate a polarizer using various settings and later take it into the field.

    I have access to an evenly illuminated daylight light table and a very accurate Minolta one degree spot meter. Could I take readings through the polarizer on the light table at various settings, mark the polarizer, then use it in the field. There I can work with the compensation values I previously marked.

    Another question arises - would a linear polarizer fool a one degree Minalto spot meter into giving inaccurate readings or would it be best to use circular polarizer? I understand a circular polarizer is used with modern electronics.

    Does anybody have any suggestions or a fast accurate way to use polarizers at various settings with a view camera that does not have electronics ? Only a hand held one degree spot meter will be used.

    Please contact tallltandj

  2. #2

    Metering with Polarizer filters

    Using different degrees of compensation for different polarizer settings may be an unnecessary level of precision. I tend to add two stops whenever the polariz er is on the camera, regardless of just where it is set, and it seems to work fi ne.

  3. #3

    Join Date
    Feb 1998

    Metering with Polarizer filters

    A linear polarizer should be just fine for your uses. I also use 2 stops compens ation with a polarizer. I did a test like you mentioned when I first started usi ng a polarizer, and I measured a 1 1/3 stop difference, but this still gave me u nderexposed chromes. I finally got to 2 stops, and this seems just right. You on ly want to compensate for the neutral density portion of the polarizer. You do n ot usually want to compensate for the polarization, or there would be no point i n using the filter in the first place. A polarizer varies the relative contrast of objects. If you adjust for the polarization, you run the risk of blowing out your highlights. Just install the filter, adjust it for the degree of polarizati on you want, add 2 stops for the neutral density of the polarizer, and shoot. Yo u may want to shoot the scene using a few different ND compensations, as some po lorizers may have slightly different ND values, and settle on the one that seems best. Good luck.

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