A CPOL (circular polarizing filter) can be used any time you’re in the outdoors, especially in the bright sun. It reduces reflections, and deepens/saturates colors like a blue sky. In bright sun,‚ you’ll often get skies that are blown out if you don’t use this filter. It makes the sky much bluer and richer looking in many cases without really affecting the other tones in the image. You will note the greatest results when the sun is low in the sky (so early morning and later afternoon/evening). The CPOL will not help your color and saturation much on overcast days, or when the sun is high in the sky.

For more information on this amazing little gadget, including a little insight into the ‘rule of thumb’ when using a CPOL, visit this link on polarizers in our photography forum

Here’s a link from B&H where you can look at or purchase different polarizers.
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