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This question already has an answer here:

I am wanting to invest in a polarising filter for my camera (a Canon T2i/550D). What sort of things should I be looking for? What differentiates a good polariser from a bad one? Are there any brands to go for/avoid? Do you have any particular recommendations for specific filters?

merged by John Cavan Dec 31 '13 at 21:20

This question was merged with How do I choose a polarizer? because it is an exact duplicate of that question.