The Tiffen 4.5-inch Round 1.2 Neutral Density (ND) Filter has multiple uses and offers the possibility to achieve otherwise impossible results. nnIt allows the photographer to adjust exposure without affecting colour balance. ND filters appear grey and reduce the amount of light reaching the sensor of a digital camera or the film plane of a traditional camera. nnNeutral Density filters are used to create unusual special effects such as capturing the "blur" of rippling water from a waterfall or the swirling effect of city traffic.nnTiffen's ColorCore glass is produced by a process that involves permanently laminating the filter material between two pieces of optical glass polished to tolerances of one ten-thousandth of an inch, then mounting them in precision aluminium rings. nnDetermining which neutral density filter gives ideal results for a given lighting situation requires knowledge, experience and a collection of such filters.nnNeutral density filters have four main usesn-Allow the use of slow shutter speeds, particularly with high-speed films, to record the movement of subjects such as waterfalls, clouds or carsn-Decrease depth of field by allowing the use of wider apertures, which helps separate subjects from their backgroundn-Decrease the effective ISO of high-speed films (above 400 ISO) and allow their use outdoors in bright situationsn-Allow cinema and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes that could cause overexposurennColorCore Technologyn-Tiffen filters are manufactured using ColorCore technology, a closely guarded proprietary process that involves permanently laminating the filter material between two pieces of optical glass polished to tolerances of one ten-thousandth of an inch, then mounting them in precision metal ringsn-The ColorCore process allows Tiffen to control the colour and density of their filters, as well as the characteristics of special effects filters with precision far superior to typical mass-tinted filters, which generally exhibit colour and density variationsnnSuperior Qualityn-Major Hollywood film studios rely on Tiffen filters for their multi-million pound productions. Superior quality and design make Tiffen the go-to choice for filmmakers, professional photographers and even NASAn-Tiffen has also received an Emmy from the Academy of Television Arts and Sciences for engineering excellence