The A Tiffen Black Satin Filter Ahelps to reduce the overall contrast of an image and better control the highlights within a scene. In addition to rendering highlights with a grittier, more grainy appearance, this filter also helps to subtly soften facial blemishes and wrinkles for a natural, refined look. The 2 density provides more contrast and highlight reduction than the 1, but less than the 3, while still producing a soft, yet natural appearance. This filter is constructed from Water White glass and is made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass, grinding flat to a tolerance of 1/10,000th of an inch, and mounting to precision metal rings.