Fotodiox Optical Filter, Star 4 Cross Filter, fits 77mm Lens Filter Thread
The Fotodiox Star 4 (cross screen filter) is an optical filter that generates multiple points of light, or 'stars', streaking outward from a central light source. The lighting within the scene takes on a more sparkling, alluring appearance. This effect is produced by a series of thin lines etched into the flat optical surface of the clear filter. Lines in one direction produce a four-pointed star, just a streak through the center of the light. Generally, mid-range or larger apertures are sufficient to attain a good star effect. The size and brightness of the star lines produced are a function of the size, shape, and brightness of the light source. Each filter comes in a storage case.