The Tiffen 4.5" Round Neutral Density (ND) 0.3 Filter has several uses and offers the ability to achieve results that would otherwise be impossible.nnIt allows the photographer to adjust exposure without affecting colour balance.nnND filters appear grey and reduce the amount of light reaching a digital camera sensor 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 waterfall water or the swirling effect of city traffic.nnTiffen's ColorCore glass is produced by a process that permanently laminates the filter material between two pieces of optical glass polished to tolerances of one ten-thousandth of an inch, then mounts them in precision aluminium rings. Determining 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 motion 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 film 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 exclusive process that permanently laminates the filter material between two pieces of optical glass polished to tolerances of one ten-thousandth of an inch, then mounts them in precision metal ringsn-The ColorCore process allows Tiffen to control the colour and density of its filters, as well as the characteristics of special effects filters with precision far superior to typical dyed-in-the-mass filters, which typically exhibit colour and density variationsnnSuperior Qualityn-Hollywood's major film studios rely on Tiffen filters for their multi-million pound productions. The superior quality and design make Tiffen the predominant choice of filmmakers, professional photographers and even NASAn-Tiffen has also received an Emmy from the Academy of Television Arts and Sciences for its engineering excellence