Nikon D5100 - Manual (Page 85)

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t
4
Open the shutter.
Bulb : After focusing, press the shutter-release button on the camera or optional
remote cord all the way down. Keep the shutter-release button pressed until
the exposure is complete.
Time : Press the ML-L3 shutter-release button all the way down.
5
Close the shutter.
Bulb : Take your finger off the shutter-release button.
Time : Press the ML-L3 shutter-release button all the way down. Shooting ends
automatically after thirty minutes.