| Graduated Neutral Density Filter |
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2-stop (ND2) graduated ND filter.]] A graduated neutral density filter, also known as a '''graduated ND filter''', '''split neutral density filter''', or just a '''graduated filter''', is an Optical Filter that has a variable light transmision. Typically half of the filter is of Neutral Density which transitions, either hardly or softly, into the other half which is clear. It is used to bring an overly-bright part of a scene into the Dynamic Range of film or sensor. For example, it can be used to darken a bright sky so that both the sky and subject can be properly exposed. Although its importance may have lessened with the advent of the modern Digital Darkroom , it is still an important tool for professionals because a digital sensor that is "blown out", i.e., reading maximum values, records no usable data for later processing. EXTERNAL LINKS
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