FYI, polarizers come in two types, circular and linear. linear polarizers screw on but have a rotating bezel to adjust the filter. As the day goes on and as your azimuth changes you'll want to change the angle of the filter to create the affect you want, i.e. better sky contrast or the ability to reduce water glare. Using polarized filter in photography is a dynamic process. I was thinking doing the same thing but unless you have a specific planned shot it may be tougher than you think to get the affect you want. Personally I have always been disappointed with circular polarized filters. B+W make great quality filters for cameras, I know my 42mm one from B&H was pricy. If you find some good options and please post and of course post some pics... Best of luck.
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