55mm Variable Nd Filter Nd2-1000 , 10 Levels Adjustable From Nd2 To Nd1000, For Lenses With 55mm Filter Thread - Camera Filters - AliExpress
Best variable ND filter - Camera Jabber
SLR Magic 77mm Self-Locking Variable Neutral Density SLR-77VND
Amazon.com : 72mm NDX Variable Range Neutral Density Fader Filter Adjustable from ND2 - ND1000 for Sigma 18-35mm F1.8 DC HSM Macro : Electronics
Amazon.com : K&F Concept 43mm 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
ProMaster Variable ND Filter - 77mm
82mm Slim Adjustable ND Lens Filter Fader Variable Neutral Density ND2 to ND400 | eBay
K&F Concept Nano-X ND2-ND32 Green Multicoated Variable KF01.1375
Fotga 52mm Slim Fader Variable ND Filter Adjustable Neutral Density ND2 to ND400|Camera Filters| - AliExpress
Amazon.com : NEEWER 77mm HD Variable ND Filter ND2-ND32 (1-5 Stops) No X Cross/Optical Glass/30 Layer Nano Coated/Ultra Slim Aluminum Alloy Frame/Water Repellent/Anti Scratch Adjustable Neutral Density Filter : Electronics