Hoya HMC ND x4 72 mm

Neutral density filter for wider apertures or longer exposures without affecting colour balance Enables slow shutter speeds to be used, especially with fast films, to record movement in subjects such as waterfalls, clouds, cars, seas etc Decreases depth of field by allowing wider apertures to be used, which helps separate subjects from their back... moreground Decreases the effective ISO of high speed film (ie: above ISO400) and allows it to be used outdoors in blight situations Allows 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 To fit 72 mm thread size

For Wider Apertures or Longer Exposures enable slow shutter speeds decrease depth of field by allowing wider apertures reduce the amount of light reaching the film/sensor no affect on color balance