from B+W represents an innovative design in lens coating. Single coating is applied to one layer on each glass surface. This improves light transmission from about 92% (in uncoated glass) to about 98%. Single coating also has certain anti-reflective properties that help prevent against ghosting and internal flaring. This filter has several uses and offers the possibility to achieve otherwise unachievable results. ND filters appear gray and reduce the amount of light reaching the film. They have no effect on color balance. For those who wish to create some unique and special effects, this filter will be indispensable. Create a feeling of movement by shooting a rippling stream and watch the water 'blur". Or create an impression of busy city life by shooting traffic and see how the cars blend into one another with a sense of swirling action.