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NEUTRAL DENSITY FILTER |
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| Neutral Density Filter | ||||||||||
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These neutral density filters possess level spectral transmittance characteristics in the visible region and attenuate light by absorption with minimal reflection. Typically, neutrality and density of absorptive filters are a function of the material and the thickness. Since Hoya neutral density filters are held to a specific optical density, the thickness is only a function of the glass type. They are useful in light control applications for measuring instruments and exposure control in imaging. Spectral variations occur as optical density increases. |
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| TECHNICAL SPECIFICATION | ||||||||||
| Dimensional Tolerance | ±0.1mm (25mm Dia.); ±0.2mm (50mm sq.) | |||||||||
| Design Wavelength |
400 - 700nm |
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| Parallelism |
<0.02mm |
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| Thickness |
2.5mm ±0.5mm |
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Flatness |
<=1 lambda per inch |
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