The K&F Concept ND2-ND400 52mm Fader Slim Professional Variable Neutral Density Camera Lens Filter is a versatile and powerful tool for photographers of all levels. It allows you to reduce the amount of light entering your lens by 1 to 9 stops, without affecting the color balance of your image. This makes it ideal for a wide range of photographic techniques, including long exposure photography, motion blur photography, and portrait photography.