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I used to use double polarizing filter on my webcam but since I managed new drivers (not toucam webcam) I am now able to remove my double polarizing and adjust the exposure setting.
If you cannot adjust the exposure setting during recording then you may have no other option other than to use double polarising filter. They do give a big range of darkening. The other problem with using double polarising is that it may extend the focal length further and may have to fit them in a way so they don't do that, In the past I only had about 2mm of FL left before I ran-out of focus. For me it was annoying as I had to pull out the webcam everytime I wanted to adjust it.
Try to get the drivers adjustment to work before trying to use double polarising. You will save a lot of hassles.
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