B001XXA61Q Kenko 77mm Zeta C-PL Wideband ZR-Coated Slim Frame Camera Lens Filters

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They also enable colors to become more saturated and appear clearer with better contrast.
This effect is often used to increase the contrast and saturation in blue skies and white clouds.
Kenko”s C-PL filter do not affect the overall color balance of a shot.