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Thread: Circular Polar filter

  1. #1
    Senior Member JC1808's Avatar
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    Default Circular Polar filter

    Hi All,

    First time using this type of filter....is it only can try out on bright day light to see the different between w or w/o mount on the filter?

    Understand that with a Circular Polar Filter, its eliminates the light reflected from water, glass, painted or lacquered surface ...shop windows more transparent...etc..
    Just now, tried shot my house glass cabinate (for things display inside), I tried with or with out using the circular Polar filter...and there's no different...I can still see reflection... Should I try it on a bright Day and maybe I can see the different more clearly?

    btw, my this filter I kept for a period of time...noticed that the surface now have stains errrrr look like "oil-stains"...anyone know what is that and i used lens cleaner to clean it but wont help....anyway is still ok for me, I'll be using with LX3 the diameter is small so filter center portion still look great...it just only the corner have this stains...





    Last edited by JC1808; 20th January 2010 at 10:34 PM. Reason: add texts and photos

  2. #2

    Default Re: Circular Polar filter

    Erm. What brand CPL is that?
    Alpha

  3. #3

    Default Re: Circular Polar filter

    'France' - Cokin.

    Polarization only occurs at certain angles and non-metallic surfaces.

    Also, try turning the filter around while looking through it.

  4. #4

    Default Re: Circular Polar filter

    u need to shoot from certain angle to get the maximum effect, then rotate the front element of your CPL to adjust the amount of effect.

    read the following website for detailed explanation, note the angle to get maximum effect.
    http://www.cs.mtu.edu/~shene/DigiCam...polarizer.html

  5. #5

    Default Re: Circular Polar filter

    Quote Originally Posted by Dream Merchant View Post
    'France' - Cokin.

    Polarization only occurs at certain angles and non-metallic surfaces.

    Also, try turning the filter around while looking through it.
    A Cokin filter and oil stains like that??
    Alpha

  6. #6
    Moderator Octarine's Avatar
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    Default Re: Circular Polar filter

    Quote Originally Posted by Dream Merchant View Post
    'France' - Cokin.
    P164 indeed is the CPL of the Cokin series. Either this is a cheap copy or the improper storage has started already destruction of the filter. Air / humidity / whatever has started creeping between the two glass surfaces. Gone case.
    TS: Read up about the usage of CPL, it's not a 'wonder filter' or wand to remove all kinds reflections. It depends on more factors and first of all direct sunlight where a polarization layer can be filtered out.
    More to read: http://www.great-landscape-photograp...ng-filter.html
    EOS

  7. #7

    Default Re: Circular Polar filter

    The oil stain is due to the CPL layer dislodging from the glass resulting in wavy surface. Poor quality.

    This is sure one ugly filter with those rim.

  8. #8
    Senior Member giantcanopy's Avatar
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    Default Re: Circular Polar filter

    I have seen a Nikon CPL that suffered from the same problem. The smudge is somehow trapped between the glass layers.

    Is that a sprocket mount circular polariser ?

    ryan

  9. #9
    Senior Member JC1808's Avatar
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    Default Re: Circular Polar filter

    Quote Originally Posted by Octarine View Post
    P164 indeed is the CPL of the Cokin series. Either this is a cheap copy or the improper storage has started already destruction of the filter. Air / humidity / whatever has started creeping between the two glass surfaces. Gone case.
    TS: Read up about the usage of CPL, it's not a 'wonder filter' or wand to remove all kinds reflections. It depends on more factors and first of all direct sunlight where a polarization layer can be filtered out.
    More to read: http://www.great-landscape-photograp...ng-filter.html
    Hi Octarine,

    I think is the poor storage handling...gone case...but as I am using it with a 52mm camera, and the center area of the CPL there is no "oil-stain" on the surface, I am not sure can still salvge and use it or is better to get a new CPL......

    btw, thanks for the link!

  10. #10
    Senior Member Diavonex's Avatar
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    Default Re: Circular Polar filter

    Polarization is most effective at 90 degrees to the sun. With the sun right behind you (180 degrees), polarization is almost non-existent.

  11. #11

    Default Re: Circular Polar filter

    think of the filter more of like a blind... it cuts light from 2 directions... if you put 2 of those lens together at some angle it will totally block out all lights...

    have fun. It will be very useful in capturing scenery with nice sky colours...
    P&S: Sony U20, Pana-leica FZ5, Canon S90, Pana DMC-T3
    SLR: Nikkor F60, Oly E-510, Oly E-5

  12. #12
    Senior Member JC1808's Avatar
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    Default Re: Circular Polar filter

    Hi all,

    Need helps...I tried out using a CPL....I rotate the CPL to get the amount of effect of the clouds, but the building looks like underexplose....

    Can teach me how to avoid that...

    Both taken at ISO80 A mode F2.0 using LX3

    W/O CPL


    With CPL
    Last edited by JC1808; 25th January 2010 at 06:06 PM.

  13. #13
    Moderator Octarine's Avatar
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    Default Re: Circular Polar filter

    Look where the sun is ... your CPL cuts off stray light that brightens the front of the building. Read your manual for Exposure Compensation.
    EOS

  14. #14
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    Default Re: Circular Polar filter

    Quote Originally Posted by JC1808 View Post
    Hi all,

    Need helps...I tried out using a CPL....I rotate the CPL to get the amount of effect of the clouds, but the building looks like underexplose....

    Can teach me how to avoid that...

    Both taken at ISO80 A mode F2.0 using LX3
    A CPL cuts 2 stops of light to your camera, so either adjust your exposure compensation as mentioned or reduce your shutter speed if you're shooting in manual.

  15. #15
    Senior Member JC1808's Avatar
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    Default Re: Circular Polar filter

    Thanks Octarine & sabee~

    I tried it again!!

  16. #16
    Senior Member JC1808's Avatar
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    Default Re: Circular Polar filter

    Hi Octarine & Sabee,

    hmmm....I tried again both photo setting is same ISO80 A mode but pic1 is without any Exposure Compensation while the pic 2 I set the Exposure Compensation to +1 EV....
    is this what both of you mean?

    Pic 1


    Pic 2


    but....maybe I still dont understand arghhhh...must read more!!

    Pic 3 is totally without using any CPL and without any Exposure Compensation....I only see slight different from Pic 1, where the flat look abit underexposure..the sky colour do not look "rich" with Pic 2... am I right?

  17. #17

    Default Re: Circular Polar filter

    Quote Originally Posted by jc1808 View Post
    hi all,

    need helps...i tried out using a cpl....i rotate the cpl to get the amount of effect of the clouds, but the building looks like underexplose....

    Can teach me how to avoid that...

    Both taken at iso80 a mode f2.0 using lx3

    w/o cpl
    ...

    With cpl
    ...]


    Quote Originally Posted by jc1808 View Post
    hi octarine & sabee,

    hmmm....i tried again both photo setting is same iso80 a mode but pic1 is without any exposure compensation while the pic 2 i set the exposure compensation to +1 ev....
    Is this what both of you mean?

    Pic 1
    ...

    Pic 2
    ...

    But....maybe i still dont understand arghhhh...must read more!!

    Pic 3 is totally without using any cpl and without any exposure compensation....i only see slight different from pic 1, where the flat look abit underexposure..the sky colour do not look "rich" with pic 2... Am i right?
    ...
    erm, what are the things that you dun understand?

    read again the link i posted in earlier post above, u need to be shooting at 90 degree from the sun to get the maximum effect of CPL, if you are shooting with sun in front or behind you, CPL will have no (or very little) effect to your photo. CPL will also have less effect if you using it on an overcast day.

    looking back at your photos, first set of photos, from the shadow cast on the building, you can see clearly where the sun is, the sun is "almost" directly above you, so you were shooting at almost 90 degree to the sun, you can see how dramatic the effect is with or without CPL.

    second set of photos, where is the sun? i cant see any shadow on the building, my guess is tat was an overcast day or the sun was *hiding* behind the cloud at that time, hence less (or none) effect by using CPL, and think back what was the direction of sun, directly above you? behind you? etc, which may contribute to your final photo.

    anyway, here's the link i posted earlier, which also include the angle needed to remove reflection from water surface etc.
    http://www.cs.mtu.edu/~shene/DigiCam...polarizer.html

    HTH.

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