***** ********** *****77mm Variable ND Filter Features Optical Glass Made in Japan, 16 Layers MRC and Nano Coatings. ***** *****77mm Variable ND Filter Uses 2 Pics 16 Layer MRC CPL Filter of Different Diameters(74mm and 83mm, A Total of 4 Optical Glasses), So That Vignetting Does Not Appear in the Picture. ***** *****77mm Variable ND Filter Unique Framework Design, Use Interval Adjustment Locking to Avoid Cross-over. ***** *****77mm Variable ND Filter More than 10-Stop ND2-ND1000 Stepless Adjustment Makes Photography More Convenient and Faster. ***** *****We Laser Engrave Lettering Into Each MRC 77mm ND Filter Traction Frame to Ensure That The Lettering Wont Ever Fade or Come Off After Aonsistent Use.