The NiSi Cinema Rotating 77mm 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 spaced 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 77mm filter has a rotating front that allows you to adjust the orientation of the light beam to suit your composition or desired effect. The filter is made from clear optical glass H-K9L for consistent image clarity and has an aluminum frame.