The Tiffen 4 x 5.65" 6-Point/2mm Star Effect Glass Filter creates multiple light points, or "stars", radiating outward from a central light source. This can give scene lighting a more sparkling and glamorous appearance. This effect is produced by a series of fine lines etched onto the flat optical surface of a clear filter. The size and brightness of the star rays produced are mainly a function of the size, shape, and brightness of the light source. - You have additional control through the choice of a particular spacing between the lines on the filter; These spacings are measured in millimetres and range from 1mm to 4mm - A 1mm spacing has twice as many lines as a 2mm spacing; It will produce a brighter star for a given source - Lines in one direction produce a two-pointed star, just a streak across the centre of the light - Tiffen offers symmetrical 4, 6, and 8-pointed star effects as well as additional asymmetric star patterns via their exclusive Hollywood FX series (North, Hyper, Vector, and Hollywood star effects) - With an 8-pointed filter, the many star rays can tend to dominate the rest of the image, so use with caution - Generally, medium or larger apertures are sufficient to achieve a good star effect; Always test before critical situations Specifications