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Title: Very weak polarizer
Review: This is a linear polarizer, as opposed to a circular polarizer that people usually buy for SLRs, so this is somewhat of a specialized review.I wanted a linear polarizer since by stacking two and rotating them relative to each other, you can block some or all of the light transmitted, like a variable neutral density filter. With good polarizers, this works great. When the filters are at 90 degrees to each other, no light is transmitted at all. But with these Tiffens, very little light was blocked when crossing them at 90 degrees. Bottom line: the polarization ratio of these filters is very weak, meaning that these polarize light only a little bit. See similar comments about the 77 mm Tiffens.
