Nikon D3100 - Manual (Page 62)

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5
Start recording.
Press the movie-record button to start recording (the
camera can record both video and sound; do not cover the
microphone on the front of the camera during recording).
A recording indicator and the time available are displayed
in the monitor. Except in
i and j modes, exposure can
be locked by pressing the AE-L/AF-L button ( 0 80) or (in
modes P, S, and A) altered by up to ±3 EV in steps of 1 /
3
EV
using exposure compensation ( 0 81). Focus can be
locked by pressing the shutter-release button halfway.
6
End recording.
Press the movie-record button again to end recording.
Recording will end automatically when the maximum
length is reached, or the memory card is full.
A
Taking Photographs During Movie Recording
To take a photograph during movie recording, press the shutter-release button all the
way down and hold it in this position until the shutter is released.
A
Maximum Length
Each movie file can be up to 4 GB in size and 10 minutes long; note that depending on
memory card write speed, shooting may end before this length is reached (
0 177).
Movie record button
Recording indicator
Time remaining