How to Enable Custom Functions on Your Canon EOS 6D

By Doug Sahlin

You can choose from six custom functions to modify exposure on your Canon EOS 6D. Other functions enable you to change exposure or ISO increments, but the default settings are usually fine. One useful custom function is Safety Shift.

When you shoot in Aperture Priority or Shutter Priority mode, you can choose to shift the shutter speed and aperture, or the ISO if the lighting changes dramatically and the subject gets considerably brighter or darker. When you shoot in Programmed Exposure mode (P), your only option is to shift the ISO speed. Here’s how to enable it:

  1. Press the Menu button.

    The previously used menu displays.

  2. Use the Multi-controller button to navigate to the Custom Functions tab.

    C.Fn I: Exposure is first on the hit parade and is selected unless you’ve dabbled with another custom function previously.

  3. If C.Fn I: Exposure is not highlighted, use the Multi-controller or the Quick Control dial to highlight the option and then press the Set button.

    The Exposure custom functions display.

  4. Press the Multi-controller button until 6 appears in the window on the right side of the dialog and then press Set.

    The default Safety Shift option displays. The default option is to Disable Safety Shift.


  5. Use the Multi-controller or the Quick Control dial to highlight the desired option.

    The text of the option you choose changes to blue. Choose Shutter Speed/Aperture to shift the shutter speed and/or aperture when lighting conditions change dramatically, or choose ISO speed to shift the ISO to a setting that will maintain a normal shutter speed and aperture when lighting conditions change dramatically.

  6. Press Set to apply the change.

There are other custom functions that may be useful for the type of photography you do, or for the way you photograph. Explore them to figure out what’s right for you.