Using the Infrared Index - EF 35-350mm f/3.5-5.6L USM

Article ID: ART122008 | Date published: 05/12/2015 | Date last updated: 08/17/2015


Using the Infrared Index - EF 35-350mm f/3.5-5.6L USM


Using the Infrared Index
EF 35-350mm f/3.5-5.6L USM

The red scale on the outside of the distance scale window is the infrared index. Use this index for adjusting the focus when using black and white infrared film. Make sure a red filer is attached to the lens.

After focusing normally, read the distance indicated in the distance scale window, then turn the manual focusing ring slightly so that the distance reading aligns with the infrared index of the number equal to the current focal length.

  • When adjusting the focus, set the focus mode switch to M before turning the manual focusing ring. Manual focusing is also possible after the subject is focused when the camera is set to One-shot AF mode.
  • The lens' infrared index is scaled with references to and infrared wavelength of 800nm. Since the scale references may differ depending on the type of black and white infrared film, we recommend taking several frames with slight shifting the focusing distance for each shot
  • When using infrared film, be sure to read the instructions



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