Ritz Gear&trade; 58mm Premium HD MC Fader ND Filter With SCHOTT OPTICAL GLASS High Quality German SCHOTT Optical Glass 12 Layer HD Multi Coating + Offers 2 - 2000 Stops of Neutral Density Water Repellent + Smoothly Rotates to Whatever Density You Need Holds Optical Quality at All Settings + Does Not Affect Coloration of The Photo No Need to Purchase Separate ND Filters