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50.8mm Dia. x 200mm FL, 3 - 12μm Coated, ISP Optics Germanium (Ge) PCX Lens

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Diameter (mm):
50.80 +0.00/-0.13
Effective Focal Length EFL (mm):
200.00 @10.6µm
BBAR (3000-12000nm)
Coating Specification:
Ravg <5.0% @ 3 - 12μm
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Surface Quality:
Irregularity (P-V) @ 10.6μm:
Focal Length Tolerance (%):
Centering (arcmin):
Center Thickness CT (mm):
3.00 ±0.20
Edge Thickness ET (mm):
Radius R1 (mm):
Clear Aperture CA (mm):
Numerical Aperture NA:
Plano-Convex Lens
Protective bevel as needed
Wavelength Range (nm):
3000 - 12000
Model Number:

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:

Product Family Description

  • Ideal for Thermal Imaging Applications
  • Uncoated Transmission from 2 – 16µm
  • Available Uncoated or BBAR Coated for 3 - 12µm
  • Due to material supply chain disruptions with germanium, there may be increased lead times and price changes on our germanium products. For more information, please contact our customer service team.

ISP Optics Germanium (Ge) Plano-Convex (PCX) Lenses provide transmission and low absorption through the Long-Wave Infrared (LWIR) spectrum, making them useful for thermal imaging applications. Germanium is chemically inert and insoluble in water with a Knoop Hardness of 780, making it ideal for applications requiring rugged optics. However, Germanium is subject to thermal runaway and should be used at temperatures below 100°C. ISP Optics Germanium (Ge) Plano-Convex (PCX) Lenses are available uncoated with a broad transmission range from 2 – 16µm or with a Broadband Anti-Reflection (BBAR) coating for enhanced transmission in the Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR).