The only filters that darken the sky in color photography without affecting the color balance, a polarizing filter will decrease reflections and glare from glass, water and other reflective surfaces.
It can dramatically increase contrast and color saturation for sharp, vividly colored pictures.
And, because they use Nikon glass, Nikon filters are noted for their exceptional sharpness and clarity.
(A Circular Polarizer is necessary for use with auto focus cameras.
Standard [or linear] polarizers can cause under-exposed and out-of-focus pictures when used on an automatic focus camera.)
