Hoya 52mm Variable ND Filter (0.45 to 2.7 (1.5 to 9 stops) A-52VDY
Zomei 58mm Fader Variable Nd Filter Adjustable Nd2 To Nd400 Nd2-400 Neutral Density For Canon Nikon Hoya Sony Camera Lens 58mm - Camera Filters - AliExpress
Freewell 82mm Threaded Hard Stop Variable Nd Filter Standard Day 2 To 5 Stop Camera Filter - Camera Filters - AliExpress
Amazon.com : 77mm ND Variable Neutral Density Filter for Canon EF-S 17-55mm f/2.8 is USM Lens : Electronics
Meike MK-EFTR-C Drop-in Filter Mount Adapter EF to EOSR with Variable — Meike Global