Tiffen 77mm ND 0.9 Filter (3-Stop) 77ND9 B&H Photo Video
Tiffen 77mm Graduated 0.6 ND Digital HT Filter 77HTCGND6 B&H
Amazon.com : K&F Concept 77mm Variable ND Filter ND2-ND32 Camera Lens Filter (1-5 Stops) No X Cross HD Neutral Density Filter with 28 Multi-Layer Coatings Waterproof : Electronics
Tiffen 77mm ND 0.6 Filter (2-Stop) 77ND6 B&H Photo Video