The NiSi Cinema Rotating 72mm Allure Streak Blue (2mm) is a special effect filter that reproduces a single beam of light from a point light source. This filter features a series of etched lines that run 2 mm apart across the filter surface. It creates the effect of elongated blue streaks that radiate horizontally from the light source, typically seen when using an anamorphic lens. The 72mm filter has a rotatable front, similar to a CPL. When the filter is rotated, the orientation of the light beam can be adjusted to fit the composition or desired effect. The filter is made from clear optical glass H-K9L for consistent image clarity and has an aluminum frame.