K&F Concept Polarizers Filter Polarizers provide color and contrast enhancement. 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. It also removes glare from non-metallic surfaces, such as windows and water. Color saturation in general, especially outdoors, can be improved significantly. Think of it as sunglasses for your camera. Area of sky most effectively polarized with a Circular Polarizer: Point your index finger at the sun. With your thumb extended at a right angle (90), rotate it around the axis of the index finger. It will point out the band of deepest blue from horizon to horizon. Features 1: Enhance Color & Contrast CPL filter can enhance the color and contrast, and remove non-metallic reflections such as water, and glass to show the true color, especially used in white cloud and blue sky photography. Features 2: Waterproof 18 Multi-Layer Coated 18 multi-layer coating reduces reflection, and glare and improves color saturation and contrast. Features 3: Ultra-Slim Frame Avoid Vignetting Only 5.3mm thickness frame, there is no vignetting even on wide-angle and telephoto lenses, and the CNC-non slip frame helps install and remove the filter easily. Features 4: Imported AGC Glass Avoids Glares Made by Japanese imported AGC glass, no effect on the image color, restores the natural color. What's in Box 1* Nano-K CPL Filter 1* Carrying Box Note: New and old packages are sent randomly. All send Cleaning Cloth for Free Gifts!!