http://www.photography.ca/blog/2009/09/05/the-truth-about-polarizing-filters/
http://www.luminous-landscape.com/tutorials/understanding-grads.shtml
http://www.tomzeman.com/HowTo/filters.htm
1. What is a polarizing filter and why is it important?
2. What is the difference between a neutral density filter and a graduated neutral density filter?
3. What is the difference between a clear filter and a UV filter?
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