Amazon.com : B + W 77mm UV Protection Filter (010) for Camera Lens - Xtra Slim Mount (XS-PRO), MRC Nano, 16 Layers Multi-Resistant and Nano Coating, Photography Filter, 77 mm, Clear Protector :
B+W 77mm XS-Pro Digital ND Vario MRC-Nano Filter 66-1072522 B&H
B+W 77mm ND 1.8-64X with Single Coating (106) : Camera Lens Neutral Density Filters : Electronics - Amazon.com