Sekonic SPEEDMASTER L-858D Operating Manual page 190

7) Ambient Mode Setting
You can select Measuring Modes to be displayed on the Measuring Mode Screen.
Measuring Mode Screen
Operation
1.
Touch the [Ambient Mode] Button on page 2 of the Custom
Setting Menu Screen.
The Ambient Mode Screen is displayed.
Custom Setting Menu Screen
Measuring Mode Screen
All OFF in Ambient Mode
Ambient Mode Screen
175
Measuring Mode Screen
Individually OFF in Ambient Mode
Default