circular polarizer filters

9 years 5 months ago #130038 by Monitor Boy
Do you think it is best to leave your CP filters attached to your lens all the time and just turn the filter on or off as needed or to leave it off and put it on only when you intend to use it?


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9 years 5 months ago #130044 by Tgauge9
I do not leave mine on. You also can not turn it off, if you mean like turning off a switch.


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9 years 5 months ago #130046 by Baydream
The filter will reduce the light getting to your sensor making your lens slower. Best to use it when needed and remove it when not needed.

Shoot, learn and share. It will make you a better photographer.
fineartamerica.com/profiles/john-g-schickler.html?tab=artwork

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9 years 5 months ago #130048 by Monitor Boy
well if you rotate it to use the filter then you should be able to rotate it to turn the filter so it isnt polarized right?


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9 years 5 months ago #130051 by Tgauge9
Yes you turn the filter for desired effect but it still is darking the image when its on. So you will be losing some light with it always on.


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9 years 5 months ago #130054 by Baydream
Look at the filter. No matter which way you turn it, it is dark. That reduces light passage.

Shoot, learn and share. It will make you a better photographer.
fineartamerica.com/profiles/john-g-schickler.html?tab=artwork

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9 years 5 months ago #130055 by Monitor Boy
Oh ok. Thank you guys. :) It never really gets turn off...unless I take it off from the lens.


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9 years 5 months ago - 9 years 5 months ago #130109 by Henry Peach
If it worked all the time then I might be more inclined to leave it on, but it's effectiveness depends not only on adjusting the filter, but it's orientation to the light source. With really wide lenses I often see the polarizing effect fade and strengthen across the photo. That's no good. If I'm not getting a good polarizing effect I'd rather not have it cutting down on the light.

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9 years 5 months ago #130127 by cod
Most polarizers lose 1 to 2 stops of light depending on how you have set them. If you are not "polarizing the light" then you are essentially using your filter as a 1 stop neutral density filter. I wouldn't do that without good reason.

As has been pointed out, the degree of polarization depends on the direction relative to the light source. Polarization typically works best when you are shooting at right angles to the light source. When shooting almost parallel to the light source the polarizer is pointless. Again you're losing light for no reason. And as Henry pointed out, since the degree of polarization depends on angle, wide angle shots can be messed up by by a polarizer.

As with all filters, polarizers have a particular function. Use them deliberately when you know you need that function. Don't use them the rest of the time.

Chris O'Donoghue
Winnipeg, Canada
codonoghue.prosite.com

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