Sunglasses for your lens! Polarizer filters are an essential filter every photographer should have. Polarizing filters provide color and contrast enhancement. Reflected light often shows up as whitish glare that washes out color in an image. A Polarizer filter 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 by using polarizer filters.