Nikon 5400 用户手册

If no operations are performed for one minute (three minutes when menus are dis-
played), the monitor will turn off automatically and the camera will enter standby 
mode to reduce the drain on the batteries (when the camera is powered by an AC 
adapter, the monitor will turn off after thirty minutes).  The camera can be reactivated 
by:
• Pressing the shutter-release button halfway
• Pressing the 

 button

• Pressing the 

 button to display the menu for the current mode

• Pressing the 

 button to enter quick review

• Rotating the mode dial to select a new mode
The length of time before the camera enters standby mode can be changed using the 
Auto off option in the setup menu (

 140).  The camera will not enter standby mode 

when connected to a computer (

 83).