B+W 49mm 110 ND 3.0-1,000X (110M) 66-1066178 Neutral Density Filter with Multi-Resistant Coating (MRC) 3.0 ND filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required. Providing a 10 stop exposure reduction, this filter allows you to control depth of field and convey movement more easily. Constructed from high quality Schott glass for optical clarity. Brass filter ring helps to prevent jamming and provides additional strength. Plastic case included for storage and transport. Multi-Resistant Coating