The Tiffen 4 x 4" Nude/FX 4 filter is a skin tone enhancement filter that brings gentle warmth to the image and helps reduce imperfections. This filter works by infusing the background areas of the scene with the filter's tone and blending skin tones with additional warmth. Density 4 offers more skin tone enhancement than 3, but less than 5. nnTiffen filters are manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and polishing 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- Enhances skin tones and reduces imperfections.n- Brings additional warmth to the entire image for a pleasant and vibrant quality.n- Helps reduce bluish tints and improve skin tone vibrancy.nnnSpecifications:nn- Type: Skin tone enhancement filtern- Size: 4 x 4" / 101.6 x 101.6 mmn- Density: 4n- Effect: Brings warmth and control for skin tone photographyn- Construction: ColorCore technology