Hoya 49mm HMC NDX4 Screw in Filter

Reduces the amount of light to the camera sensor by 2 f-stops without effecting colour balance Enables slow shutter speeds to be used to record movement in subjects such as waterfalls, providing a silky smooth effect to flowing water Decreases depth of field by allowing wider apertures to be used, helping to separate subjects from their background Eliminates overly bright, washed-out images Hard Coated' HMC Multicoating process suppresses ghosting, flare and reflections, and increases light transmission