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用于描述ND滤光片不透明度的第三个数字是光密度。在数学上（对不起，如果你读了我的生物，你会知道我曾经教数学，所以我只需要挤一点），光密度是光线减少的因子的对数（基数10）。一站式滤光片将光线减少2倍（允许传输1/2光线）。因此，它的光密度将是0.3的log（2）。对于4档滤光片，光线减少了16倍（允许传输1/16的光线）。因此它的光密度是log（16），它是1.2。0.3的光密度的每个倍数减少一次光传输的光。Cokin，Tiffen，Formatt Hitech，Lee和B + W使用此评分系统。一个蒂芬0.6 ND过滤器是一个2站式过滤器。Lee's Big Stopper Neutral Density 3.0过滤器是一款10级过滤器。最后，Formatt Hitech的Firecrest ND 3.9 过滤器是一款高达13级的过滤器！
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