【Function 】The main funciton of ND filter is to avoid over-exposure in outdoor photograpy, reducing the light entering in lens even on slow shutter speed , ensuring the expousre time and no color cast,recommending use it in landscape photography. | 【Waterproof & Scratch Resistant】Each filter in this kit with double side waterproof and scratch resistant function , protecting the lens well , If you accidentally spill water on the filter, the water droplets will still remain solidified and will not spread out, easily for cleaning and carrying. | 【Professional Design】 Using Super Slim Original Design to Avoid Vignetting When You Taking Photo. | 【UPGRADED VERSION OF DESIGN】One is the model and size are engraved on each filter so that you can quickly find the filter you need in many filters. Another is This filter is designed with a small hole design with a drawer package, which is convenient to take out the filter. | 【NOTE】 Please verify your camera's lens thread size before ordering. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "ø" (diameter) symbol.