Hoya CPL


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May 11, 2008
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#1
Hi guys...recently bought a Hoya CPL.
However, why do i find that the CPL is not taking any effects on pix taken other than darken the whole pix?

Took the 3 pix together at same timing on a grey-ish day after a rain. No photoshop, no white balance, no nothing else.

1. With CPL



2. With UV Filter



3. Without any Filter
 

Jan 23, 2005
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#2
However, why do i find that the CPL is not taking any effects on pix taken other than darken the whole pix?
What effects are you expecting that aren't there in the particular case that you posted?
 

Six-GHz

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Nov 29, 2006
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#4
Such filters can be used to cut reflections and accentuate blue skies. Er... your picture got nothing to begin with! Wait for a bright sunny day and try once more, you'll notice the difference! ;)
 

dingzyangz

Senior Member
May 8, 2008
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#5
CPL is used to reduce reflection and enhance the blue sky. There is none of the mentioned in the picture. Try looking into the sky, and turn ur CPL. you should see the effect.

another thing is... if u shoot in full manual, you can be using the same shutter speed and aperture when u are shooting with and without the filter. CPL cuts out light and pictures will appear dimmer if u use the same settings.
 

giantcanopy

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Feb 11, 2007
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#6
Hi w3iw3n

Polarisation can occur via reflection for non metallic surfaces. A reflection from a body of water presents a (polarised) the glare prevents viewing beneath the water. In this case a polariser that cuts out the glare can effectively allow viewing through the water surface. This is the same for glass as well. You would want to shoot perpendicular to the source sunlight from the reflecting surface to achieve maximal polarisation effect.

Foilages improve somewhat with polarisers as a result of the cutting off of some glare from them, improving their greens.

Skies are made more blue and clouds more contrasty when the polariser filters off the stray light bounced by the overlying dust and haze particles in the skies.

In this case what are you looking for to polarise ?

The crystals in the polarisers with their axis aligned in a particular plane while allowing one plane of light to pass, will greatly attenuating the rest of the planes. hence it will darken the picture.

Ryan
 

May 11, 2008
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#7
hi all..thanks for the comments. i'm looking at enhancing the sky to being more blue. guess its the lack of sun that is not putting the polarisers to work.
 

Octarine

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Jan 3, 2008
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#8
hi all..thanks for the comments. i'm looking at enhancing the sky to being more blue. guess its the lack of sun that is not putting the polarisers to work.
If there is no blue you can't enhance it. It need at least a little bit of a certain colour to enhance it via filters. Or you need to resort to PS.
 

dingzyangz

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May 8, 2008
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#9
i wouldnt say its the lack of sun... i guess its too much clouds. :bsmilie:

keep trying... no one perfects it from the start.

hi all..thanks for the comments. i'm looking at enhancing the sky to being more blue. guess its the lack of sun that is not putting the polarisers to work.
 

attap seed

Senior Member
Feb 16, 2006
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#10
hi all..thanks for the comments. i'm looking at enhancing the sky to being more blue. guess its the lack of sun that is not putting the polarisers to work.
good work.

u decided to experiment yourself and did actual tests, instead of jus posting and waiting for answers.

keep shooting!
 

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