Kenko Zeta Zéta C-PL Filter 46mm The "Zéta" series is Kenko filter's highest-grade line. This product line utilizes superior optical technology and precision machining. C-PL filters have the effect of removing surface reflections from water and glass, deepening the color of the blue sky, and making the colors of foliage, mountain surfaces, buildings, etc., appear very vivid. https://www.kenko-tokina.co.jp/imaging/filter/pl/4961607033524.html