A truly Unique filter, the Tiffen Warm Soft/FX combines the innovative diffusion technology of the Soft/FX filters with the exclusive 812 warming filter, balancing contrasting skin tones to make people look their best. This filter is available in differing strengths, the higher the number, the more dramatic effect. Tiffen filters are manufactured using ColorCore technology, a closely guarded proprietary process that entails permanently laminating the filter material in between two pieces of optical glass that are ground flat to tolerances of a ten-thousandth of an inch, then mounting them in precision metal rings. The ColorCore process allows total control over the color and density of Tiffen filters, and the characteristics of special effects filters with much greater accuracy than typical dyed-in-the-mass filters.