The Tiffen 4 x 5.65" Digital Diffusion/FX 4 filter is a softening and diffusion filter specifically designed to appear invisible, as if no filtration were applied. nnCompared to other diffusion filters, this filter offers virtually no halo or loss of contrast for more subtle applications. nnIt helps soften facial imperfections, wrinkles and gently softens textured backgrounds whilst maintaining sharp focus. nnDensity 5 offers more softening than density 4. nnThis filter is constructed from Water White glass and is manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding flat to a tolerance of 1/10,000th of an inch. nnThis filter measures 4 x 5.65" / 101.6 x 143.5 mm.nn-Softening and diffusion filter to soften skin details and smooth textured backgrounds.n-Gives the impression that no filtration is being used and helps maintain sharp focus.n-Water White optical glass for excellent clarity.