To record movies, press the movie-record button; a recording indicator will be displayed and the camera will show the available recording time. Press the movie-record button again to end recording. During playback, movies are indicated by a movie icon and can be played back by pressing the OK button in full-frame playback.
The most important thing to note when filming movies is focus mode. The SLR cameras require you to choose a focus mode. If you select AF-F (full-time-servo AF), the camera will automatically adjust focus in response to changes in the distance to the subject. To choose the focus mode, press the info button and choose "AF-F" in the focus-mode selection display. In AF-F mode, the camera will automatically adjust focus in response to changes in the distance to the subject.