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A Neutral Density filter or ND filter is a “grey” filter, it appears gray and reduces the amount of light reaching the film or sensor, but does not have an effect on color balance.
The purpose of standard photographic neutral density filter is to allow the photographer greater flexibility to change the aperture or exposure time, allowing for more control, particularly in extreme circumstances such as on a very bright day.
This filter can be used to prevent strong overexposure even when using a slow shutter speed. It’s perfect for shooting in heavily-lit settings or for extended exposures. For example, when you use a slow shutter speed to capture a bright moving object, such as a waterfall, this filter is your best choice. See the pictures below for comparative shots of a waterfall taken both with and without the use of this filter. The ND Filter we offer is double thread with 2¡Á, 4¡Á and 8¡Á(ND2 ND4 ND8) to indicate the amount of light a ND filter can reduce. Different neutral densities have different effects. You can use the filter individually or in any combination to meet your demand.
* To enable slow shutter speeds to be used, especially with fast films, to record movement in subjects such as waterfalls, clouds, cars, seas, etc.
* To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background.
* To decrease the effective ISO of high speed film (i.e.: above ISO400) and allow it to be used outdoors in blight situations.
* To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which would normally cause over-exposure.