The Hoya ND 200 reduces light by an equivalent of 7 2/3 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. Hoya offers an exclusive and extensive range of ND filters embedded in the PROND series for both photographers and filmmakers. PROND filters utilize Hoya's clear optical glass, which is mounted in a lightweight, precisely crafted aluminum frame. The frame features a front filter thread, allowing you to attach additional filters or a lens cap. With Hoya's exclusive ACCU-ND technology, a uniform reduction of light in 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.