Tiffen 58mm Variable Neutral Density Filter 58VND B&H Photo Video
Best variable ND filter - Camera Jabber
8-STOP VARIABLE ND FILTER(58mm-82mm) – Official 7Artisans Store
Amazon.com : K&F Concept 58mm 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
Best variable ND filter - Camera Jabber
Review: K&F Concept 58mm Variable Neutral Density Filter