Anyone here ever tried stacking two polarizing filters to achieve the effect of having a variable-density ND filter? I'm curious to try it, but I'm wondering if there are pitfalls to this that I'm missing. I figure I could mark the filter rings and measure light transmission with a light meter to figure out how much light is being transmitted, and then keep a reference card to know where to set it in order to get the density I need.
Thoughts?
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