As I mentioned before, it's very tricky to use a polarizer with an ultrawide. Even at 18mm, the polarizing effect will be uneven, because the angle of light entering the lens will vary enormously from one side to the other. Skies will be extremely unevenly blue, reflections will appear and disappear depending on where you're looking, and saturation will be uneven as well. While it's possible, I don't recommend bothering with a polarizer if you're going to be anywhere wider than 20mm.
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