The Variable ND is a specialty filter designed to allow quick and continuously variable adjustment of light attenuation between approximately 2-6 stops, depending on conditions. Variable ND filters are very popular with HDSLR filmmakers because they allow the cinematographer to quickly and precisely adjust exposure. The Variable ND is the quickest way to make exposure adjustments for the time constrained independent filmmaker. This filter uses a rotating ring to adjust filter density. Variable NDs are technically not NDs at all, but a combination of 2 specially designed polarizers which create an ND-like effect, meaning the filter has a slight polarizing effect.
Neutral Density (ND) filters are the essential filters for digital photography and cinematography
ND filters reduce the amount of light entering the camera
Allow the photographer to create the following effects:
Ethereal waterfalls and streams
Flat water effect in oceans and lakes
Streaky clouds
Motion blur in sports
Long exposures to remove people from public areas
Shallow depth of field using fast lenses wide-open
Adjusting aperture for cinematography
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Advance Sound Company 157 Rome Street Farmingdale, NY 11735 USA (631)667-0973 www.advancesound.com