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Instructions
Examine your camera to confirm that it will accept a polarizing filter. Look at the front of the camera lens as if you were looking into the camera. Check for threads that will allow you to screw the polarizer onto the lens.
Determine the size of polarizer you'll need by finding the diameter of the lens. Look at the back of your lens cap or another filter you may have that fits the lens. The number will be printed on either of these and is measured in millimeters. Lenses typically range from 50mm to 80mm.
Purchase the best quality circular polarizer your budget will allow. Expect to pay $50 or more for a professional quality filter. Less expensive filters can be purchased for as little as $15, but generally don't perform as well. Look for high-grade filters that offer multi-coatings to maximize polarization as well as prevent scratches and stains. Check the glass in the filter for defects, bubbles and discolorations. Select the polarizer that has a thin metal ring to prevent unwanted vignetting. Filters that use brass rings are of higher quality than those that use steel rings.
Choose a circular polarizer with a protruding adjustment arm if you'll be shooting in a situation in which rotating the polarizer on the end of the lens will be difficult. For example, an adjustment arm will allow you to adjust the filter while wearing gloves.