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B+W Neutral density filter

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B+W Neutral density filter

From Wikipedia, the free encyclopedian. (/http://en.wikipedia.org/wiki/Neutral_density_filter) In photography and optics, a neutral density filter or ND filter is a filter that reduces or modifies intensity of all wavelengths or colors of light equally, giving no changes in hue of color rendition. It can be a colorless (clear) or grey filter. The purpose of a standard photographic neutral density filter is to allow the photographer greater flexibility to change the aperture, exposure time and/or motion blur of subject in different situations and atmospheric conditions. For example, on a very bright day, one might wish to photograph a waterfall at a slow shutter speed to create a deliberate motion blur effect. In order to do this, one would need a shutter speed on the order of tens of seconds. There might be so much light that even at minimum film speed and a minimum aperture such as f/32, the desired shutter speed would still let in too much light and the photo would be overexposed—or, if shooting at aperture priority, the camera would select a shutter speed that would be too fast to achieve the desired effect. In this situation, applying an appropriate neutral density filter is the equivalent of stopping down one or more additional stops, allowing for the slower shutter speed and the desired motion-blur effect

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