K&F Concept 105mm Circular Polarizers Lens Filter HD 28 Layer Super Slim Multi-Coated

K&F Concept Nano-X Sereis Circular Polarizers Filter with 28 Multi-Layer Coatings for Camera Lens 
--Polarizers provide color and contrast enhancement. Reflected light often shows up as a whitish glare that washes out color in an image. A Polarizer filter 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.
--A Circular Polarizer has the same effect as a Polarizer and is used on cameras with beam splitting metering systems commonly found on autofocus SLRs (for most 35mm auto-focus cameras see your camera manual).
--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.