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This worked fine for me. They block all light that passes through them when two filters are placed at 90 degrees to each other. I'm not sure I like the "sticky" surface that comes automatically to one side of the film, but I'll deal with it. For those who fail to block all light, it is important to note that once light is polarized, it can become unpolarized once it passes through another medium. So if the protective films on the polarizing film are not removed, they will not work properly. The "sticky" side will also only slightly disturb the polarization, so it's important to take this into account in your setup as well.
29/03/2023
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