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ND Filters

ND Filters

Non-Reflectance ND Filters

Neutral density (ND) filters can reduce the light intensity of all wavelengths as equally as possible, while also giving no changes in the hue of color rendition.

Non-Reflectance ND filters produced by Tokai Optical coating technology produce an excellent standard of flatness of the spectral transmittance and very low reflection characteristics. These characteristics are ideal for measuring instruments and exposure control imaging.

These characteristics are available even in the ND filter with the OD value of 5, which is mostly suitable for observing sunlight or measuring extra high brightness light.
(The optical density is related to the transmission by the following equation:
T = 10-OD x 100 = percent transmittance.)

Specifications

SubstrateBK7
Sizeφ12.5x2t
φ25x2t
φ50x2t
Diameter Toerance+0/-0.2mm
Thickness Tolerance±0.1mm
Surface Accuracyλ
Clear Aperture90%
Wavelength range400-700nm

Spectral Property

Product Informations

Part NumberOptical DensityAverage ReflectanceAverage
Transmittance
Flatness
( Tmax-Tmin )
φ12.5φ25φ50
NDF-001202-03NDF-002502-03NDF-005002-030.3≦4%50.0%±5%4.5
NDF-001202-06NDF-002502-06NDF-005002-060.6≦4%25.0% ±3%2.0
NDF-001202-09NDF-002502-09NDF-005002-090.9≦4%12.5% ±3%1.5
NDF-001202-12NDF-002502-12NDF-005002-121.2≦4%6.30% ±1%1.2
NDF-001202-15NDF-002502-15NDF-005002-151.5≦4%3.10% ±1%0.7
NDF-001202-18NDF-002502-18NDF-005002-181.8≦4%1.60% ±1%0.5
NDF-001202-20NDF-002502-20NDF-005002-202≦4%1.00% ±0.5%0.5
NDF-001202-30NDF-002502-30NDF-005002-303≦4%0.10% ±0.05%0.1
NDF-001202-40NDF-002502-40NDF-005002-404≦4%0.01% ±0.005%0.002
NDF-001202-50NDF-002502-50NDF-005002-505≦4%0.001% ±0.0005%0.0002
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