RotaPola 6.6x6.6 Filter and FrameRotaPola frame with custom 165mm German anti reflective circular polarizing filter the largest filter available in the industry and the ONLY one featuring an AR coating on both sides of the glass! Unlike other cheaper rotapolas, this oversized AR filter allows you to use wider angle lenses without vignetting. Features include an engraved dot to record the polarizer position and delrin rotation controls on both sides, a Lentequip original feature, to