The Tiffen Multi Rota Tray with 138mm Circular Polarizer is a geared rotating tray that allows the use and rotation of a 138mm circular polarizer filter and an optional 4x5.65" circular polarizer in a single 4x5.65" filter tray. The tray is designed for use with matte boxes that lack a rotating filter stage, or for instances where a secondary rotating filter stage is required in a non-rotating stage. The filter fits into matte boxes that conform to the ARRI R2 tray size standard.