Hoya 67mm Variable Density Screw-in Filter
Brand: Hoya

This filter makes easy to adjust the brightness of a scene and have more control over the exposure settings of your camera, for both still photography and video use. The filter reduces light transmittance between approximately 1/3 and 1/400th of its original level, by rotating the inner filter ring. This allows a much greater range of shutter speed and aperture values to be set according to the desired effect. For example a long shutter speed can be used to blur water or crowds of people, even in full sunlight. The practical exposure range and light transmittance will vary depending on the situation.

Rotating filter ring with scale indicating max. through min. settings
Provides 1.5 - 9 stop exposure reduction, equal to filter factor NDX3 - NDX400
Enables slow shutter speeds to be used
Allows greater control over depth of field
Does not affect colour balance or detail