Neutral Density filters appear grey and reduce the amount of light reaching the film/light sensor. They have no effect on color balance. They are Multicoated to minimize reflection at the filter surfaces which reduces flare and ghosting.
ND filters have four main uses:
- To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars.
- 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 (above ISO 400) and allow it to be used outdoors in bright situations.
- To allow cine and video cameras(which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure.
More information about Marumi filters: (Link to Marumi International Website)
