neutral density filter

An ND (neutral density) filter reduces the amount of light entering the lens so you can use a wider aperture or a slower shutter speed without overexposing the image. This lets you control depth of field and create motion effects (e.g., silky water or streaked clouds). Some ND filters also include infrared attenuation or coatings that help preserve color and reduce overexposure artifacts.

The listings here show optical densities roughly from 0.3 to 3.0 ND, which corresponds to about a 1 to 10 stop reduction in light. Product labels may use ND numbers (e.g., ND2 to ND1000) or named fixed strengths (for example, ND16) — fixed filters give a single preset attenuation while other items cover a broader range.

By reducing light, ND filters let you use longer exposure times or wider apertures without overexposing the image. That extended exposure blurs moving subjects (water, clouds, traffic), producing the smooth, silky or streaked effects photographers look for. Product descriptions here explicitly mention motion blur and blurring water.

Multi‑layer or nano coatings are called out to minimize surface reflections and flare, while infrared-protective treatments reduce IR contamination that can shift color. These features help maintain accurate color and limit unwanted flaring.

Variable ND filters are adjusted by rotating the front filter ring to increase or decrease density; some models also have visual markings (for example, dots on the ring) where each mark represents approximately one stop of attenuation.

Slim, low-profile frames and multi-threaded designs are highlighted to reduce the risk of vignetting on wide-angle lenses and to make it easier to stack multiple filters together.

Some filters include accessories such as a storage case, a microfiber cleaning cloth, and a small user guide or instruction booklet.