Amazon.com : K&F Concept 52mm Magnetic Variable ND Lens Filter ND8-ND128 (3-7 Stops) + Magnetic Filter Basic Ring Kit, Adjustable Neutral Density Filter with 28 Multi-Layer Coatings Waterproof (Nano-X Series) : Electronics
Kenko filter for camera PRO ND8 52mm for adjusting of light 352625 w/Tracking# | eBay
NiSi SWIFT FS ND Filter Kit with ND8 (3 Stop), ND64 (6 Stop) and ND1000 (10 Stop) for 52mm | 55mm | 58mm | 62mm Filter Threads + Case | NiSi Optics USA