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RFQ

Absorptive ND Filter

Product Info

These 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.   


Neutral-density-filter1


Specifications

  

Material:

NG1, NG4, NG9, or NG11

Wavelength range:

400-700nm

Size:

+/-0.20mm

Thickness:

+/-0.5mm

Clear aperture:

>80% of dimension

Parallelism:

< 3 arc minutes

Surface quality:

80-50 scratch and dig

Flatness:

< 1λ, subject to the size

OD tolerance:

+/-5%

Coating:

AR coating

 

These 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.   


Neutral-density-filter1


Specifications

  

Material:

NG1, NG4, NG9, or NG11

Wavelength range:

400-700nm

Size:

+/-0.20mm

Thickness:

+/-0.5mm

Clear aperture:

>80% of dimension

Parallelism:

< 3 arc minutes

Surface quality:

80-50 scratch and dig

Flatness:

< 1λ, subject to the size

OD tolerance:

+/-5%

Coating:

AR coating