Using the Infrared Index

Article ID: ART122423 | Date published: 05/12/2015 | Date last updated: 08/17/2015


Using the Infrared Index


Using the Infrared Index

The infrared index corrects the focus setting when using monochrome infrared film. Focus on the subject manually, then adjust the distance setting by moving the focusing ring to the corresponding infrared index mark.

The intermediate marker between 200 and 135 is 150 mm.

Some EOS cameras cannot use infrared film. See the instructions for your EOS camera.


  • The infrared index position is based on a wavelength of 800 nm.
  • Be sure to observe the manufacturer's instructions when using infrared film.
  • Use a red filter also when you take the picture.



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