>
> I'm aware of that effect but hadn't realized that meant the
> filter factor
> was not constant. Since polarized light is not a constant,
> the effect of
> removing it wouldn't be constant, but I had not realized that
> this meant
> the filter factor was not constant.
>
Basically all filter factors are nominal (except maybe ND, UV, any
others ?), if you use a red filter in tungsten light (relatively higher
red component of the spectrum compared with sunlight) then the filter
factor will be less than the "nominal" 8x, whereas a green filter will
have a higher filter factor under tungsten than sunlight. Then the
colour of the subject comes into it to, i.e. how do you want a
particular subject rendered relative to the rest of the scene, e.g. do
you want the clear sky rendered a light blue or a dark blue with the
polarizer in place.
...Wayne
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