中性密度（neutraldensity）又叫中灰密度镜，简称ND镜，其作用是过滤光线
中性密度（neutral density ）又叫中灰密度镜，简称ND镜，其作用是过滤光线。这种滤光作用是非选择性的，也就是说，ND镜对各种不同波长的光线的减少能力是同等的、均匀的，只起到减 弱光线的作用，而对原物体的颜色不会产生任何影响，因此可以真实再现景物的反差。美国公司可以为客户提供不同透过率和不同尺寸的。
中性密度滤光片：
型号 | 透过率 | 尺寸 |
ND 0.1 A - 80% Trans | 80% | 25mm直径或更小尺寸 |
ND 0.1 B - 80% Trans | 80% | 26mm - 36mm直径 |
ND 0.1 C - 80% Trans | 80% | 37mm - 50mm直径 |
ND 0.2 A - 63% Trans | 63% | 25mm直径或更小尺寸 |
ND 0.2 B - 63% Trans | 63% | 26mm - 36mm直径 |
ND 0.2 C - 63% Trans | 63% | 37mm - 50mm直径 |
ND 0.3 A - 50% Trans | 50% | 25mm直径或更小尺寸 |
ND 0.3 B - 50% Trans | 50% | 26mm - 36mm直径 |
ND 0.3 C - 50% Trans | 50% | 37mm - 50mm直径 |
ND 0.4 A - 40% Trans | 40% | 25mm直径或更小尺寸 |
ND 0.4 B - 40% Trans | 40% | 26mm - 36mm直径 |
ND 0.4 C - 40% Trans | 40% | 37mm - 50mm直径 |
ND 0.5 A - 32% Trans | 32% | 25mm直径或更小尺寸 |
ND 0.5 B - 32% Trans | 32% | 26mm - 36mm直径 |
ND 0.5 C - 32% Trans | 32% | 37mm - 50mm直径 |
ND 0.6 A - 25% Trans | 25% | 25mm直径或更小尺寸 |
ND 0.6 B - 25% Trans | 25% | 26mm - 36mm直径 |
ND 0.6 C - 25% Trans | 25% | 37mm - 50mm直径 |
ND 1.0 A - 10% Trans | 10% | 25mm直径或更小尺寸 |
ND 1.0 B - 10% Trans | 10% | 26mm - 36mm直径 |
ND 1.0 C - 10% Trans | 10% | 37mm - 50mm直径 |
ND 1.3 A - 5% Trans | 5% | 25mm直径或更小尺寸 |
ND 1.3 B - 5% Trans | 5% | 26mm - 36mm直径 |
ND 1.3 C - 5% Trans | 5% | 37mm - 50mm直径 |
ND 1.5 A - 3% Trans | 3% | 25mm直径或更小尺寸 |
ND 1.5 B - 3% Trans | 3% | 26mm - 36mm直径 |
ND 1.5 C - 3% Trans | 3% | 37mm - 50mm直径 |
ND 2.0 A - 1% Trans | 1% | 25mm直径或更小尺寸 |
ND 2.0 B - 1% Trans | 1% | 26mm - 36mm直径 |
ND 2.0 C - 1% Trans | 1% | 37mm - 50mm直径 |
ND 3.0 A - .1% Trans | 0.1% | 25mm直径或更小尺寸 |
ND 3.0 B - .1% Trans | 0.1% | 26mm - 36mm直径 |
ND 3.0 C - .1% Trans | 0.1% | 37mm - 50mm直径 |
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