Custom design for the Sony FE 12-24mm f/2.8 GM Allows the use of two filters with an integrated rotating True Color CPL The True Color CPL prevents the yellow cast introduced when using regular CPLs 360 degree rotating Integrated locking system to lock the front filter holder Gear for orienting polarizer No vignetting when the holder is in a straight position. Very small vignetting went he holder is at a special 45-degree angle