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138mm circular polariser in a geared, rotating tray designed to fit 4x5.65" / PV matte boxes. Ideal for use with clip on matte boxes that do not have rotating stages, such as the Arri LMB-5 / 15 / 25.
The standard 0.8 pitch gears on either side of the rotating tray mean a wireless follow focus can be used to remotely rotate the filter.
The 138mm diameter of the filter means wider lenses can be used without vignetting when compared to a 4.5" round filter.