83C: Setting Custom FunctionsC.Fn-00: " (Distance indicator display)You can select the distance indicator display on the LCD panel from metersand feet.0: m (Meters (m))1: ft (Feet (ft))C.Fn-01: # (Auto power off)When the Speedlite is not operated for approx. 90 seconds, the power turnsoff automatically to save energy. You can disable this function.0: ON (Enabled)1: OFF (Disabled)C.Fn-02: $ (Modeling flash)0: % (Enabled (Depth-of-field preview button))Press the camera’s depth-of-field preview button to fire the modelingflash.1: & (Enabled (Test firing button))Press the Speedlite’s test flash button to fire the modeling flash.2: ' (Enabled (with both buttons))Press the camera’s depth-of-field preview button or the Speedlite’s testflash button to fire the modeling flash.3: OFF (Disabled)Disables the modeling flash. When the temperature of the flash head rises due to continuous flashfiring, etc., the time until auto power off takes effect may become longer. During radio transmission wireless sender flash shooting (p.57) or duringlinked shooting (p.69), the time until auto power off takes effect is approx.5 min.