Neutral Density 500 Filter with 67mm diameter - MFND500-67 | Manfrotto Global
Zomei 67mm Fader Variable ND Filter Adjustable ND2 to ND400 ND2 400 Neutral Density for Canon NIkon Hoya Sony Camera Lens 67 mm|nd2 to nd400|lens 67zomei 67mm - AliExpress
Tiffen 67mm ND 0.9 Filter (3-Stop) 67ND9 B&H Photo Video
Syrp Small Variable ND Filter - 67 mm - Neutral Density - Reduces Exposure by 1 - 8.5 stops (ND2 - ND400) - 52 and 58 Adaptors and Case Included - High - Quality Japanese Glass: Amazon.co.uk: Electronics & Photo