Square Neutral Density Filter / ND Filter/Camera Filter
1. ND4 average transmittance of 25%
2. Optical Glass Material

ND4  Square Neutral Density Filter / ND Filter/Camera Filter

ND filters appear gray and reduce the amount of light reaching the film. ND filters also do not have an effect on color balance.

Specification:

ND4:reduce two gear of the aperture,average transmittance of 25%

Feature:
1.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.
2.Decrease depth of field by allowing wider apertures to be used, in turn helping to separate subjects from their background.
3.Decrease the effective ISO of high-speed film (above ISO 400) and allow it to be used outdoors in bright situations.
4.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