The Tiffen Digital Diffusion/FX 3 4 x 5.65" Filter is a softening and diffusion filter specially designed to appear invisible, as if no filtration were applied. nnCompared to other diffusion filters, this filter offers virtually no flare or loss of contrast for more subtle applications. nnIt helps reduce facial blemishes, wrinkles and gently smooths textured backgrounds whilst maintaining sharp focus. nnDensity 1/4 offers more softening than 2, but less than 4. nnThis filter is manufactured from Water White glass and is produced using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding it 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 detail and smooth textured backgrounds.n-Gives the impression that no filtration is being used and helps maintain clear focus.n-Water White optical glass for excellent clarity.