Vivitar 72mm Variable ND Filter - 0.3 to 3.0 (1 to 10 stops) VIV-VNDX-72
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Cokin 52mm NUANCES Variable ND Filter (5 to 10-Stop) CNV32-52
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ND2 400 Neutral Density Fader Variable ND filter Adjustable for Panasonic FZ1000 II Camera HC VX1 VX1 HC VXF1 VXF1 Camcorder|Camera Filters| - AliExpress