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  • CC-3 Free Optics

Cosine Correctors

Lead Time: 2 weeks

From $58.00

"Prices exclude tax, logistics, custom and trade tariffs."

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Cosine correctors are optical diffusers (opaline glass, PTFE or Spectralon) that couple to fibers and spectrometers to collect signal from 180° field of view. Cosine correctors are specified for setups requiring the redistribution of incident light, such as measuring spectral irradiance of a plane surface in air or other media.

Typical applications include relative and absolute spectral intensity measurements of LEDs, light sources and other radiant sources (including solar). Options are available for connecting to optical fibers or spectrometers.


  • Wide FOV – collects light from 180° field of view
  • Versatile – couples to fibers or directly to spectrometers
  • Irradiance measurement tool – ideal for intensity measurements of LEDs, light sources and solar sources

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Subject to change depending on model type


Connects To:
Optical fiber, Spectrometer
Lens Material:
f/2 fused silica Dynasil
Optical Diffuser:
Opaline glass, PTFE, Spectralon
Wavelength Range:
200nm - 2.5μm
Connector Threads:
"3/8-24 (ports) 9.525 mm x 25.4 mm (nipple)"
5 mm
Diffusers (Diameter):
3900 µm, 7140 µm
Dimensions (OD):
12.7 mm, 16.5 x 16.5 x 19.9, 6.35 mm
Field Of View:
Focal Length Specification:
10 mm
Mirror Coating:
UV-enhanced aluminum
Mirror Reflectivity:
>80% from 200-1000 nm
Replacement Diffuser:
Yes, Yes, with restrictions*
11.3 g