How to block infrared light

Written by jeffrey brian airman
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How to block infrared light
Infrared filters cause stars and other celestial bodies to appear more clearly. (Telescope à l'aube image by Antares from

You can completely block infrared light and allow the remaining light spectrum to pass through using a custom filter. Specialised glass filters are designed to absorb or reflect infrared light, giving the viewer a clearer view of the image in the visible light spectrum. Blocking the infrared radiation reduces heating of electronic optical equipment caused by light coming in through the lens. Create a vibrant visual display by using infrared filters to keep optical devices cool and accurate.

Skill level:

Things you need

  • Microfiber lens cleaning cloth
  • IR cut-off filter
  • Owner's manual (optional)
  • Lens cap or case

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  1. 1

    Clean the infrared cut-off filter and any exposed glass on the optical device with a microfiber lens cleaning cloth.

  2. 2

    Install the infrared cut-off filter on the optical device. Read the owner's manual for the camera, telescope or other device you are using to be sure you have a compatible filter and understand proper installation. Most filters are simply held by the sides and slid or screwed on over the existing exterior lens.

  3. 3

    Operate the optical device as normal, noting the difference in colour and clarity. Remove and replace the lens carefully to see the effect it has on the view of an image. Cover the infrared blocking filter with a lens cap or put it away in a case when it is not in use.

Tips and warnings

  • Some combination optical filters filter the infrared and ultraviolet range that is outside the visible spectrum. Consult with an optics specialist to find the best possible light filter for the application and equipment.
  • Optical filters are easily damaged. Handle them carefully and protect them with regular cleanings and soft secure storage.

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