Reduces the amount of light to the camera sensor by 9 f-stops without effecting colour balance Can be used to achieve super slow shutter speeds in daylight to render moving subjects invisible 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 Hard Coated' HMC Multicoating process suppresses ghosting, flare and reflections, and increases light transmission