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RE: How to use polarizer to get the sky "bluer than blue" -- 如何用偏光鏡讓藍天比藍。更藍
Actually it only works for reflected or refracted light. Aside from blue sky, it works well for reflection from ground, from tree leafs(see the photos taken at Terrace of the elephants) as well as water surface.
Feel free to check my recent post on other effects of polarizer