The Tiffen 4 x 4" Warm Black Diffusion/FX 1 filter diffuses harsh light entering the lens and produces a halo effect. Although the resulting image appears softer and more ethereal, there is little loss of clarity or detail. This filter works by diffusing light entering the lens with small aberrations; by distributing the light more evenly, a soft halo is created rather than the sharp, well-defined image achieved without a filter. In addition to the diffusion provided, a warming effect is also built into the filter, helping to further balance skin tones. Density 1 provides more softening than 1/2, but less than 2.nnTiffen filters are manufactured 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. This filter measures 4 x 4" / 101.6 x 101.6 mm.nnnFeatures:nn- The diffusion filter gives photographs an ethereal quality, creating a dreamlike atmosphere.n- The soft image quality does not detract from the overall detail of the image.n- Light entering the lens is diffused by small aberrations, creating a soft halo rather than the sharp, well-defined image achieved without a filter.n- The additional warmth provided enhances the halo effect and helps further balance skin tones.nnnSpecifications:nn- Type: Warm Diffusionn- Size: 4 x 4" / 101.6 x 101.6 mmn- Grade: Density 1n- Effect: Diffuses light entering the lens, creating a halo effect. Additional warmth is brought to imagesn- Construction: ColorCore Technology