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Old Oct 18, 2011, 7:57 AM   #1
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Default Variable ND filter vs. stacked Polarizers

I was wondering if it is better to have a variable ND filter, or stacked polarizers (meaning CP filter on LP filter, to create variable density affect)

I have a CP filter, so for me it would be easier to find a second hand LP filter (shots taken for this will probably be time lapse, so 100% quality is not needed)

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Old Oct 18, 2011, 11:24 AM   #2
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When stacking polarizing filters, you can get a purple color cast, as the shorter wavelengths are less affected by the polarizing material. This is pretty easy to deal with in a photo editor, but if you don't want to take the trouble, the variable ND would be the way to go. Haven't used one myself, but guess that they color correct by using a low pass filter behind the polarizers.

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Old Oct 18, 2011, 2:27 PM   #3
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A variable anything or a stacked anything won't be as good as a fixed single filter. Any additional optical element will degrade image quality to some extent, and multiple additional optical elements more so. Whatever you get, get something good. And in the world of filters, price is a good indication of quality.
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Old Oct 18, 2011, 3:44 PM   #4
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G'day PN

This is the sort of thing you get via 2x stacked pola filters ...

subject is water swirling over rocks

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