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The 4×4″ Streak 1mm Filter from Tiffen is a special effects filter designed to render a single light ray from a point light source. This filter features a single series of etched lines spaced 1mm apart from each other, which run diametrically across the filter surface.
The filter can be rotated to adjust the orientation of the light ray to suit your composition or desired effect. It is constructed from clear optical-grade glass. The space difference of the etched line on the filter affects and allows for varying the effect.