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Absorptive ND filters are one of simple light attenuators to be used to control the amount of light, They possess level spectral transmittance characteristics in the visible region and attenuate light by absorption with minimal reflection. they do not affect the colors of the light Since the filters have low dependency on wavelengths and optically neutral. Absorptive ND filters are useful in light control applications for measuring instruments and exposure control in imaging.
Specifications
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Item
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Commercial
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High Precision
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Material:
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Color glass from schott or equivalent
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Dimension X×Y(φ):
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1×1mm~25.4×25.4mm；φ3~φ25.4mm
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Dimension tolerance:
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±0.1mm
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±0.03mm
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Parallelism:
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＜3′
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＜30″
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Clear aperture:
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85%
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Surface quality:
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MIL20-10
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Flatness(per 25.4mm):
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λ/4@ 632.8nm
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λ/８@ 632.8nm
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Optical density tolerance:
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Typical ±5%
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Coating:
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Specified by customer
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