Nikon D330018-55VR User Manual (en)

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The Setup Menu: Camera Setup
If Release locked is selected, the shutter-release button is only 
enabled when a memory card is inserted in the camera. 
Selecting Enable release allows the shutter to be released when 
no memory card is inserted, although no pictures will be 
recorded (they will however be displayed in the monitor in 
demo mode).
Slot Empty Release Lock
G button
➜ B setup menu