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Neutral Density Optical Filters

Sofradir IR Viewers are nearing the end life as a product line.
We can offer an alternative though, so please contact us!


Neutral Density Filters


These optical filters are perfect for many imaging applications that benefit from the attenuating the transmission electromagnetic radiation.

Features

  • Highly transmissive in near-infrared band
  • Blocks short wavelength from UV through visible
  • Sharp cut-on with 40nm transition from 1% to first peak (typical)



Specifications


Diameter
25.4mm +0.0/-0.25mm
Clear Aperture
22.8mm
Thickness
<5mm (nominal)
Surface Finish
Commercial Polish


OD = Optical Density - Attenuation of transmittance by 10OD
T = Transmittance (%)
Prange = Operating Spectral Passband


Ordering Information


Item
Discription
OD=0.1, T=79.4%, Prange=400 to 2,500nm
OD=0.2, T=63.1%, Prange=400 to 2,500nm
OD=0.3, T=50.1%, Prange=400 to 2,500nm
OD=0.4, T=39.8%, Prange=400 to 2,500nm
OD=0.5, T=31.6%, Prange=400 to 2,500nm
OD=0.6, T=25.1%, Prange=400 to 2,500nm
OD=0.7, T=19.9%, Prange=400 to 2,500nm
OD=0.8, T=15.8%, Prange=400 to 2,500nm
OD=0.9, T=12.6%, Prange=400 to 2,500nm
OD=1.0, T=10.0%, Prange=400 to 2,500nm
OD=1.5, T=3.2%, Prange=400 to 2,500nm
OD=2.0, T=1.0%, Prange=400 to 2,500nm
OD=3.0, T=0.1%, Prange=400 to 2,500nm
OD=4.0, T=0.01%, Prange=400 to 2,500nm

Requires a filter holder for use with the 7215 or 7290A series.
Please order:
- F25 Filter Holder for 7215 series ElectroViewers
or
- G25 Filter Slide for 7290 series MicronViewers