Tiffen 6.6x6.6" Water White Glass Digital Diffusion/FX Filter, 4 Density

Digital Diffusion/FX introduces a slight reduction in contrast across its range. However, this very fine optical filter does not introduce a halation affect, this is because the acid etching in the glass is an extremely delicate way to bend light across the surface of an image. It also reduces stray lights ability to scatter or cause halation, which is commonly associated with the elements enclosed in a mist type filter.The subtleness of this process means that the color chart is not unduly washed out. Where the filter really gets to work is on fine detail resolution , such as wrinkles and fine lines on the skin. It also doesn't overpower the overall image, giving an out of focus look. Maintaining an apparent sharpness. This means that even stronger densities could be used without the look of the filter, without overpowering the final result.