K&F Concept 58mm 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 - Newegg.com
Amazon.com : NiSi 58mm Swift True Color ND-Vario - Variable Neutral Density Filter 1-5 Stops (ND2-ND32) - Rotating Adjustable ND, Compatible with NiSi Swift System Filters - Optical Glass, Waterproof Nano Coating : Electronics
Variable ND Filter - 52VND – The Tiffen Company
Amazon.com : 58mm ND Variable Neutral Density Filter for Canon EF 50mm f/1.4 USM Lens : Electronics
K&f Concept Nd8-nd128 Variable Nd Filter 49mm 52mm 58mm 62mm 67mm 72mm 77mm 82mm No X Spot Fade Neutral Densityr Camera Lens - Camera Filters - AliExpress
ProMaster HGX Prime Variable ND Filter - 58mm
58mm ND2-400 (9 Stops) Variable ND Filter Neutral Density Filter for Camera Lens - KENTFAITH
Tiffen 58mm Variable ND Filter-Cracks in glass | eBay