RotaPola 4x5.65 Filter and Frame, Anti-ReflectiveDon't be fooled by cheaper rota polas on the market this is the real thing featuring German anti reflective circular polarizing filter and the ONLY one featuring an AR coating on both sides of the glass! This is THE uncompromising polarizer you want in front of your precious lenses. Features include an engraved dot to record the polarizer position and delrin rotation controls on both sides, a Lentequip original feature, to allow for easier access in