The Hoya ND 500 reduces light by an equivalent of 9 stops. Neutral density filters (ND filters) are among the most sought-after and important types of photographic filters for several reasons. For photographers, ND filters provide precise control over the amount of light entering the lens, allowing for greater creative control over exposure. For video content creators, ND filters are very helpful in adjusting shutter speeds to match frame rates while maintaining depth of field in the footage. Thanks to the leading ACCU-ND technology, images do not suffer from negative effects due to color shifts that can occur from inferior materials, poor quality control during manufacturing, or issues with infrared light spectrum leakage. With HOYA's exclusive ACCU-ND technology, a uniform reduction of light in both the visible and IR spectrum is achieved. As a result, photographers need not worry about color shifts when using HOYA ND filters under various shooting conditions.