Amazon.com : K&F Concept 52mm Variable ND Filter ND2-ND32 Camera Lens Filter (1-5 Stops) No X Cross HD Neutral Density Filter with 28 Multi-Layer Coatings Waterproof : Electronics
K&f Concept Nd2-nd32 Fader Nd Filter 52mm 62mm 67mm 72mm 77mm No "x" Spot Neutral Density Variable Filter For Canon Nikon Sony - Camera Filters - AliExpress