K&F Concept Nano-X Series 67mm Variable ND Filter ND2-ND400 (9 Stops) Lens Filter with 28-Layer Coated Waterproof Anti-scratch - AliExpress
Nd Filter Camera | Variable Nd Camera Filter | Camera Filter Nd2 Nd400 | Filtre Nd 40 Mm - Camera Filters - Aliexpress
K&F Concept 58mm Variable ND2-ND400 ND Lens Filter (1-9 Stops) for Camera Lens, Adjustable Neutral Density Filter with Microfiber Cleaning Cloth (B-Series) : Electronics - Amazon.com
Amazon.com : Hoya 67mm Neutral Density ND-400 X, 9 Stop Multi-Coated Glass Filter : Camera Lens Neutral Density Filters : Electronics
Amazon.com: NEEWER 37mm Clip On ND2-ND400 Phone Lens ND Filter Kit: Adjustable Neutral Density Filter with Phone Clip Compatible with iPhone 14/14Pro/14Pro Max Samsung Android Smartphones iPad and More : Cell Phones