Star filters create multiple points of light, or "stars," streaking outward from a central light source. This can make lighting within the scene take on a more glittering, glamorous appearance. This effect is produced by a series of thin lines etched into the flat optical surface of a clear filter. The size and brightness of the star lines produced are first a function of the size, shape, and brightness of the light source. Lines in one direction produce a two-pointed star, just a streak through the center of the light. Cokin offers 4,8, and 16 point star effects. With an 16 point filter, the many star lines may tend to overpower the rest of the image, so use it carefully. Generally, mid-range apertures or larger are sufficient to achieve a good star effect. Always test before critical situations.
This filter is specific to Cokin's "P" Series filter holder and rotates within the holder.