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Thread: Questions about Circular Polarizer

  1. #1

    Default Questions about Circular Polarizer

    I am new about this topic so here it goess......
    Questions about circular polarizer

    1) How much blue/reflection can a polarizer remove from a scenery?
    I was using Kenko Circular Polarizer and it did not remove reflections from the water totally nor render the sky any darker blue, as shown in the following.
    http://www.cs.mtu.edu/~shene/DigiCam...polarizer.html

    2) I noticed that the Kenko circular polarizer introduced vigenetting...is that normal or is it because the CPL sucks?

    I use Nikon D70s with 18-70mm.

  2. #2
    Moderator catchlights's Avatar
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    Default Re: Questions about Circular Polarizer

    #1, it depends your shooting angle, will not give you a blue sky if there isn't any.

    #2, no, recommend use slim filter on most wide angle lens to prevent vigenetting, your Kenko CPL is not a slim filter, and 18~70 lens are known need to use slim filter.
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  3. #3

    Default Re: Questions about Circular Polarizer

    Though, in some cases, vignetting can be quite nice...

  4. #4

    Default Re: Questions about Circular Polarizer

    Quote Originally Posted by catchlights View Post
    #1, it depends your shooting angle, will not give you a blue sky if there isn't any.

    #2, no, recommend use slim filter on most wide angle lens to prevent vigenetting, your Kenko CPL is not a slim filter, and 18~70 lens are known need to use slim filter.
    #1, so will a good CPL remove reflections totally or only partially? I noticed that kenko only removes partially.

    What's a good recommended CPL that is economical?
    Last edited by blowblue; 1st March 2007 at 01:40 PM.

  5. #5

    Default Re: Questions about Circular Polarizer

    Quote Originally Posted by blowblue View Post
    #1, so will a good CPL remove reflections totally or only partially? I noticed that kenko only removes partially.

    What's a good recommended CPL that is economical?
    The degree of polarising is more or less similar for all brands of filters. The difference in quality may come in the for of colour neutrality, multicoating to reduce ghosting/flares, etc.

    It does not mean that good CPL will cut reflections and a cheaper on doesn't. It depends on how you use it.

    Angle of shooting is extremely important when you use polarisers. I have explained to you in another thread.

    For water surface, the effectiveness is lower when you are shooting at lower angle. If you are shooting from top down onto the water surface, that's the most effective angle for polarising filters. Play around with it.


    BC

  6. #6

    Default Re: Questions about Circular Polarizer

    Quote Originally Posted by blowblue View Post
    I am new about this topic so here it goess......
    Questions about circular polarizer

    1) How much blue/reflection can a polarizer remove from a scenery?
    I was using Kenko Circular Polarizer and it did not remove reflections from the water totally nor render the sky any darker blue, as shown in the following.
    http://www.cs.mtu.edu/~shene/DigiCam...polarizer.html

    2) I noticed that the Kenko circular polarizer introduced vigenetting...is that normal or is it because the CPL sucks?

    I use Nikon D70s with 18-70mm.
    Did you just mount the fileter onto the lens then shoot or did you adjust (turn) your polarizer before shooting?

  7. #7
    Member BlueBull's Avatar
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    Default Re: Questions about Circular Polarizer

    2) I noticed that the Kenko circular polarizer introduced vigenetting...is that normal or is it because the CPL sucks?


    Did you stack your Kenko CP onto a UV filter on your lens?
    Last edited by BlueBull; 27th March 2007 at 09:24 PM.
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  8. #8
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    Default Re: Questions about Circular Polarizer

    the cpl cannot remove 100% of reflections, especially ones that are coming directly at you. read up on how polarisers work and why does the sky gets 'bluer' and why it doesn't really produce the same effects as places like US (like in the photo)
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  9. #9
    Moderator catchlights's Avatar
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    Default Re: Questions about Circular Polarizer

    that's right, CPL does not remove metallic reflection, hotspots.
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  10. #10
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    Default Re: Questions about Circular Polarizer

    u need to read up on what polarised light is.. and how CPLs work.. the degree of effectiveness depends on the type of reflected/refracted light and the angle it hits the filter at... quality of filter has an effect but it's not that impt..

    for eg, to get maximum polarisation from the skies.. u have to shoot when the sun is at a 90 degree to where u are aiming at.. and pls remember to adjust ur polariser to see where u get the greatest effect...
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    Default Re: Questions about Circular Polarizer

    I used to think that cpl don't work for me. Until one day I realised that when I turned the polariser, I was actually screwing or unscrewing the polariser. So effectively I was doing nothing with it. Haha.

  12. #12

    Default Re: Questions about Circular Polarizer

    Any idea between B+W and Nikon CPLs? Both are very expensive.

  13. #13
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    Default Re: Questions about Circular Polarizer

    equally as good. depends on which camp you support, I've heard as many stories from each side saying the other brand causes colour casts to their pics.
    “How fortunate for leaders that men do not think.” - Adolf Hitler

  14. #14
    Moderator catchlights's Avatar
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    Default Re: Questions about Circular Polarizer

    Quote Originally Posted by di0nysus View Post
    Any idea between B+W and Nikon CPLs? Both are very expensive.
    Read post #5
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