Singh-Ray 77mm Vari-ND Variable Neutral Density Filter R-86 B&H
Amazon.com : Freewell 77mm Threaded Hard Stop Variable ND Filter Standard Day 2 to 5 Stop : Electronics
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 (Nano-X Series) : Electronics
Bower 77mm Variable Neutral Density Filter FN77 B&H Photo Video
Dodd Camera - ProMaster 77mm Variable ND Filter
NiSi 77mm Swift True Color ND-VARIO Pro Nano 1-5stops Variable ND | NiSi Optics USA
Hoya Variable Neutral Density Filter - 77mm — Glazer's Camera Inc