Combining 2 polarized filters will equal a infinitely variable ND filter?
A couple things to be aware of before you try a polorizer stack. Make sure that the brands of polorizer are the same . Different manufacturers have different ways of making polorized glass and you can end up with some "interesting" effects. (See first image) Using stacked polorizers can be a two handed affair so make sure that your camera is tri-pod mounted unless your one hand is good at turning the outer polorizer while holding the inner one steady.
You can have fun experimenting with stacked polorizers as you can never tell where or when you can use them. For these two pics I used a ND 4 filter along with a circular polorizer and a Cokin P warming filter and polorizer. ISO 100 Fuji Reala, f./32 @ 1/1000
Have Fun!!
Ernie
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