Neutral Density filter e ND filters appear gray and reduce the amount of light reaching the film, yet they have no affect on color balance.
Enables slow shutter speeds to be used, especially with high-speed films, allowing film to
record movement in subjects such as waterfalls, clouds, or cars.
Decrease depth of field by allowing wider apertures to be used, in turn helping to separate
subjects from their background.
Decrease the effective ISO of high-speed film and allow it to be used outdoors in bright situations.
To allow picture and video cameras (which have fixed shutter speeds) to film subjects such as snow,
sand or other bright scenes that can cause overexposure.
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