The Hitech 85mm, 4 Point Star Effect Resin Filter creates 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. This filter measures 85 x 85mm and fits the Cokin P series holder and the Hitech "P" series holder.