Polarizers provide color and contrast enhancement. Reflected light often shows up as whitish glare that washes out color in an image. A Polarizer corrects this problem producing deep & dramatically blue skies. It also removes glare from non-metallic surfaces & such as windows and water. Color saturation in general & especially outdoors & can be improved significantly.
A Circular Polarizer has the same effect as a Polarizer and is used on cameras with beam splitting metering systems commonly found on auto focus SLR's (for most 35mm auto-focus cameras see your camera manual).
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