The Hoya ND 200 reduces the light by an equivalent of 7 2/3 f-stops. ABOUT ND FILTERS Neutral density (ND) filters are the most popular and important type of photographic filter for several reasons. For photographers, ND filters provide precise control of the amount of light passing through the lens to allow greater creative control of exposure. HOYA offers both photographers and filmmakers its own exclusive and wide range of ND filters embedded in the PROND series. PROND filters use HOYA's clear optical glass mounted in a lightweight, precision-machined aluminum frame. The frame has a front filter thread so you can attach additional filters or a lens cap. With HOYA's exclusive ACCU-ND technology, an even reduction of light in the visible and IR spectrum is achieved. As a result, the photographer does not have to worry about color shift problems when using HOYA ND filters under different shooting conditions.
