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sorta. They'll work more as a grad-ND than anything, and you'll usually lose around 2-stops overall.
thanks! If i understand you correctly, they'll work similar to a ND gradient filter by allowing light to pass unaffected on one half (useful for the foreground in a sunset) and reduced by two stops on the other half (to reduce the relatively bright exposure of the sky in a sunset)?
My polarising filter acts as a neutral density filter, cutting two stops of light.
Helen, I haven't tried it, but I was lead to believe if you stack two polarizers and rotate them to the right (wrong?) position, the light is almost stopped by the filters. I didn't think one of the filters had to be reversed. I'm referring to linear polarizers.
...Terry
A polariser will cut the amount of light entering the lens (the amount is variable) but the effect of the filter is not really neutral. Polariser and ND filters are not the same thing and are not always interchangeable.
it reduces the amount of light without adding a colour cast. That's a neutral density, yes?