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