Ron Martinsen's Photography Blog: COMPARISON: Variable Neutral Density Filters (Singh-Ray, B+W, Hoya, Tiffen & Bower)
Hoya 82mm Variable Density 3-400 Filter
Best variable ND filter in 2022 - Camera Jabber
Zomei 58mm Fader Variable ND Filter Adjustable ND2 to ND400 ND2 400 Neutral Density for Canon NIkon Hoya Sony Camera Lens 58mm|nd2 to nd400|neutral densitylens 58mm - AliExpress
Ron Martinsen's Photography Blog: COMPARISON: Variable Neutral Density Filters (Singh-Ray, B+W, Hoya, Tiffen & Bower)