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ND 1.8 
Neutral Density Filter



Key features

  • Insensitive to angle of incidence
  • Decrease brightness without changing DoF
  • Stackable, combine ND-filters to achieve OD
  • Even attenuate avoid effects on color balance
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Schneider-Kreuznach Neutral Density Filter 43 mm ND 1.8

Schneider-Kreuznach neutral density (ND) filters uniformly reduce light intensity across the visible spectrum without affecting color balance or depth of field. By absorbing part of the incoming light, they prevent overexposure or sensor damage in demanding imaging, metrology, and laser applications.

The ND 1.8 filter reduces evenly the transmittance of light over the entire VIS spectrum. It decreases the brightness of an image without changing the depth of field (DoF). It attenuates light by absorbing a part of the energy of the VIS wavelength, without influence on the color balance. ND filters are used to control the intensity of light going through an optical system to avoid overexposure, blooming on imaging sensors and prevent damages on light sensitive measuring sensors.

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Technical specifications: ND 1.8 ND Filter

TypeStandard
Optical density1.8
Transmittance average1.6 %
Glass thickness1.3 +/- 0.2 mm

Filter specifications glossary

 

Specification Description
Angle of incidence (AOI) Angle between a ray of light and the surface normal to the surface it strikes
Cut-on wavelength Wavelength at which the transmission of the lower edge rises to 50%
Cut-off wavelength Wavelength at which the transmission of hhe upper edge drops to 50%
Central Wavelength (CWL) Center of the filter’s passband for which it is primarily designed
Full Width at Half Maximum (FWHM) Spectral bandwidth measured at 50% of the peak transmittance
Transmittance Ratio of transmitted light intensity to incident light intensity
Blocking Strong attenuation of light intensity over a specified wavelength range
Wavefront distortion Deviation of the transmitted wavefront from a reference plane
Parallelism Angular deviation between the two main surfaces of the filter
Glass thickness tolerance Permissible deviation from the specified substrate thickness
Wavelength range Spectral region over which the filter is designed to operate
Coating Applied layer(s) defining the filter’s spectral characteristics
Temperature range Recommended operational limits for ambient or device temperature
Glass thickness Nominal thickness of the filter glass
Optical density Attenuation measure defined as −log₁₀ of transmittance
Transmittance average Average light transmission across the specified wavelength range
Wavelength Wavelength range at which the polarizer specification applies
Transmittance, unpolarized light Ratio of transmitted to incident intensity for unpolarized light
Extinction ratio Ratio of transmitted intensity along the polarizer’s pass axis to that along its block axis
Max. size Largest standard dimension for the polarizer film
Temperature range Minimum to maximum temperature for reliable performance
Substrate Base material on which the polarizing film is applied
Thickness Nominal overall thickness of the polarizer film
Info Unless otherwise stated, all dimensions in this data sheet are in mm

 

Picture of the filter

Schneider-Kreuznach Neutral Density Filter 43 mm ND 1.8



Transmission of the ND 1.8 Filter


 

Transmission Data

 

Download Excel

Wavelength (nm) Transmission (%) 
350 1.552431
360 1.66189
370 1.737537
380 1.789268
390 1.827373
400 1.852673
410 1.866897
420 1.875465
430 1.880028
440 1.880991
450 1.878107
460 1.873214
470 1.868991
480 1.866017
490 1.860039
500 1.84745
510 1.832975
520 1.823174
530 1.812695
540 1.796337
550 1.774455
560 1.755256
570 1.739802
580 1.718667
590 1.697156
600 1.676938
610 1.658719
620 1.638722
630 1.61957
640 1.601503
650 1.584796
660 1.570733
670 1.556149
680 1.544555
690 1.533501
700 1.52495
710 1.519366
720 1.514104
730 1.51116
740 1.509738
750 1.507148
760 1.506829
770 1.512842
780 1.518255
790 1.521857
800 1.527512
810 1.53518
820 1.548041
830 1.560507
840 1.566673
850 1.5812
860 1.602991
870 1.625218
880 1.64514
890 1.659843
900 1.66876
910 1.676329
920 1.679387
930 1.694307
940 1.709869
950 1.715442
960 1.72165
970 1.727868
980 1.736959
990 1.745397
1000 1.750638
1010 1.761211
1020 1.767545
1030 1.76696
1040 1.766212
1050 1.765679
1060 1.778966
1070 1.798635
1080 1.803239
1090 1.794491
1100 1.786712

 

 

Mounted Industrial Filter [IF]


MountThicknessID
CMT1.3mmID to be defined
SH 25.51.3mm1105510
SH 27.01.3mm1107149
SN1 30.51.3mmID to be defined
SH 34.01.3mm1107150
SH 35.51.3mm1107151
SH 37.01.3mm1107152
SH 39.01.3mm1107153
SH 40.51.3mm1105511
SH 43.01.3mm1107154
SH 46.01.3mm1107155
SH 49.01.3mm1107156

Order nomenclature
IF ND 1.8 [Mount] [Thickness]
Example: IF ND 1.8 SH 25.5 2
 

Unmounted Industrial Filterglass [IFG]


DiameterThicknessID
22.0 mm1.3mmID to be defined
23.0 mm1.3mmID to be defined
24.0 mm1.3mmID to be defined
29.0 mm1.3mmID to be defined
31.0 mm1.3mmID to be defined
33.0 mm1.3mm1088977
34.0 mm1.3mm1089307
36.0 mm1.3mm1088978
38.0 mm1.3mm1088979
40.0 mm1.3mm1088980
43.0 mm1.3mm1088981
46.0 mm1.3mm1088982

Order nomenclature
IFG ND 1.8 [Diameter] [Thickness]
Example: IFG ND 1.8 23.0 2
 

Mounts for Industrial Optical Filters

C-Mount

Defined by 1” (25.4mm) diameter and 32 turns per inch pitch, the C-Mount thread is a popular camera mount in machine vision industry. Schneider-Kreuznach offers a C-Mount option for most filters. So filters can go in any C-Mount based mechanics in vision systems.

Another popular application, C-Mounts can easily be used for, is placing a filter in front of the sensor into the camera. The extension of the back flange distance has to be considered for imaging applications.

Key Features of C-Mount Filters:
Fits in C-Mount cameras
Black Anodized Brass

Applications of C-Mount Filters:
To be mounted in C-Mount cameras
Vision Systems based on C-Mount mechanics

Thread Diameter Clear Thickness
Aperture
1'' - 32 25.4 mm 21.1 mm 3.6 mm

 

Filter C-Mount

 

 

SH-Mount

Schneider-Kreuznach offers a variety of mounts with common thread sizes to fit on most camera lens systems. SH-Mount is the standard, when high flexibility is needed. Filters are held by retainer rings. SH-Mounts are extreme robust.

All SH-Mounts have a female and male M-thread, and can be stacked if several filters must be combined.

Key features of SH-Mount Filters:
Stackable
​​​​​Robust
Black Anodized Brass

Applications of SH-Mount Filters:
Mounted on lenses in imaging applications
Mounted on measurement instruments

Thread Diameter Clear Thickness
Aperture
M 25.5x0.5 29.5 mm 20.8mm 6.4 mm
M 27.0x0.5 31.0 mm 21.8 mm 6.4 mm
M 35.5x0.5 39.5 mm 29.8 mm 6.4 mm
M 37.0x0.75 41.0 mm 31.8 mm 6.9 mm
M 39.0x0.5 43.0 mm 33.8 mm 6.4 mm
M 40.5x0.5 44.5 mm 35.8 mm 6.4 mm
M 43.0x0.75 47.0 mm 37.8 mm 6.9 mm
M 46.0x0.75 50.0 mm 40.8 mm 6.9 mm
M 49.0x0.75 53.0 mm 43.8 mm 6.9 mm
M 52.0x0.75 56.0 mm 46.8 mm 6.9 mm
M 55.0x0.75 59.0 mm 49.8 mm 6.9 mm
M 58.0x0.75 62.0 mm 52.8 mm 6.9 mm
M 62.0x0.75 66.0 mm 56.8 mm 6.9 mm
M 67.0x0.75 71.0 mm 61.8 mm 6.9 mm

 

SH Filter-Mount

 

SN1-Mount

The SN1-Mount was designed for the in machine vision popular M30.5x0.5 thread. With its high clear aperture, vignetting can be avoided, even for wide angle applications. The filter is glued into the mount, in order to secure it against vibrations when integrated into robots or production lines. It is ideal to be used in automated fabrication.

SN1-Mounts have a male and female M-thread, and can be stacked if several filters must be combined.

Key features SN1-Mount Filters:
Maximum Clear Aperture
No vignetting
Stackable
Robust
Black Anodized Brass

Applications SN1-Mount Filters:
Mounted on lenses in imaging applications
Mounted on measurement instruments

Thread Diameter Clear Thickness
Aperture
M 30.5x0.5 32 mm 28 mm 6.5 mm

 

SN1 Filter-Mount

 

SN1-Mount

The SN2-Mount is designed for polarizers and achieves highest possible aperture, avoiding vignetting in machine vision systems. Its unique locking mechanism fixes the correct orientation, even in typical industrial environment. The filters are glued into the mount to secure them against vibrations when integrated into robots or production lines. Ideal for use in automated fabrication.

SN2-Mounts have a female and male M-thread, and can be stacked if several filters must be combined.

Key features:
Rotatable
High clear Aperture
No vignetting
Stackable
Robust
Black Anodized Brass

Applications:
Mounted on lenses in imaging applications
Mounted on measurement instruments

Thread Diameter Clear Thickness
Aperture
M 25.5x0.5 27 mm 22.7 mm 7.4 mm
M 27.0x0.5 28.5 mm 23.7 mm 7.4 mm
M 30.5x0.5 32 mm 26.7 mm 7.4 mm
M 35.5 x0.5 37 mm 31.7 mm 7.4 mm
M 37.0x0.75 38.5 mm 32.7 mm 7.4 mm
M 40.5x0.5 42 mm 36.7 mm 7.4 mm
M 43.0x0.75 44.5 mm 37.7 mm 7.4 mm
M 46.0x0.75 47.5 mm 41.7 mm 7.4 mm
M 49.0x0.75 50.5 mm 44.7 mm 7.4 mm

 

SN2 Filter-Mount

DH-Mount

Schneider-Kreuznach offers a variety of mounts for polarizers with common thread sizes to fit on most camera lens systems. The DH-Mount is rotatable to adjust polarization axis in the required orientation. Filters are held by retainer rings.

All DH-Mounts have a female and male M-thread and can be stacked if several filters must be combined.

Key features:
Rotatable
Stackable
Black Anodized Brass

Applications:
Mounted on lenses in imaging applications
Mounted on measurement instruments

Thread Diameter Clear Thickness
Aperture
M 25.5x0.5 27 mm 20.8 mm 9.2 mm
M 27.0x0.5 28.5 mm 21.8 mm 9.2 mm
M 30.5x0.5 32 mm 25.8 mm 9.2 mm
M 35.5 x0.5 37 mm 30.8 mm 9.2 mm
M 37.0x0.75 38.5 mm 31.8 mm 9.2 mm
M 40.5x0.5 42 mm 35.8 mm 9.2 mm
M 43.0x0.75 44.5 mm 37.8 mm 9.2 mm
M 46.0x0.75 47.5 mm 40.8 mm 9.2 mm
M 49.0x0.75 50.5 mm 43.8 mm 9.2 mm
M 52.0x0.75 53.5 mm 46.8 mm 9.2 mm
M 55.0x0.75 56.5 mm 49.8 mm 9.2 mm
M 58.0x0.75 59.5 mm 52.8 mm 9.2 mm
M 62.0x0.75 63.5 mm 56.8 mm 9.2 mm
M 67.0x0.75 68.5 mm 61.8 mm 9.2 mm

 

DH Filter-Mount



 

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