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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More
325nm 12.5mm Dia., High Performance Longpass Filter

High Performance OD 4 Longpass Filters

High Performance OD 4 Longpass Filters

Stock #34-295
Qty 1-5
Qty 6
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Diameter (mm):
12.50 +0/-0.2
Cut-On Wavelength (nm):
Thickness (mm):
Thickness Tolerance (mm):
Wavelength Range (nm):
200 - 1600
Angle of Incidence (°):
Optical Density OD:
Hard Coated
UV Grade Fused Silica
Surface Quality:
Transmission (%):
Longpass Filter
Rejection Wavelength (nm):
200 - 315
Transmission Wavelength (nm):
333 - 1600
Clear Aperture (%):
MIL-C-48497A, Section 3.4.1
Transmitted Wavefront, RMS:
≤λ/4 @ 633nm
Cut-On Tolerance (%):
Slope Factor (%):
Coating Specification:
Surface 1: Hard Dielectric Sputtered, Surface 2: MgF2

Regulatory Compliance

RoHS 2015:
Reach 197:

Product Family Description

  • Cut-On Slope <1%
  • Rejection OD ≥ 4.0
  • ≥91% Transmission in Pass Band

Our High Performance Longpass filters feature high transmission in the pass band combined with superior blocking in the rejection band. With a rejection band optical density of 4.0 combined with >91% in the pass band these filters are ideal for a wide variety of applications. Eliminate stray light by creating custom bandpass filters when combined with our TECHSPEC® High Performance Shortpass Filters.

Our TECHSPEC® Rotating Filter Wheel can be used for applications requiring a variety of filters.

Longpass Filter Kits

The VIS Longpass Filter Kits include 7 filters from 400-700nm and the NIR Longpass Filter Kits include 8 filters from 700-1100nm. Both are ideal for integration with our filter wheels.

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