Amazon.com : Hoya SOLAS 77mm Variable Neutral Density Filter, 1.3-stops to 8.7-stops : Electronics
Concepto K&F Filtro 77mm de densidad neutra de Densidad Neutra Variable Fader 2-400 DSLR | eBay
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
Amazon.com : K&F Concept 77mm Variable ND Filter ND2-ND400 (1-9 Stops) with Putter HD 28 Multi-Layer Coatings Import AGC Glass Adjustable Neutral Density Filter for Camera Lens : Electronics
Amazon.com : K&F Concept 77mm Variable ND2-ND400 ND Lens Filter (1-9 Stops) for Camera Lens, Adjustable Neutral Density Filter with Microfiber Cleaning Cloth : Electronics