Pentax K-X Operating Manual page 41

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When [Movie Aperture Control] is set to [Fixed] (p.149), set
the aperture using the e-dial.
Press the shutter release button fully.
Recording of the movie starts.
Press the shutter release button again.
Recording stops.
• When [Sound] is set to _1111, the camera operation sounds are also recorded.
When recording a movie, mount the camera onto a tripod and do not operate
the camera while recording.
• When recording a movie, regardless of the AF mode setting, recording starts
when the shutter release button is presse d fully even if the subject is not in
focus.
• While recording a movie, the autofocus system does not operate.
• The flash is not available.
• You can record movies continuously up to 4 GB or 25 minutes. When the SD
Memory Card is fu. recording stops and the movie is saved.
• tf you intend to shoot continuously for a long perioc use of the AC adapter
kit K-AC84 (optional) is recommended. (p.42)
• You can also use the optional remote control to control recording operations.
(p.134)
• When recording movies, only the White Balance and Custom Image (other
than Fine Sharpness) settings can be used.
• The sensitivity is fixed to [AUTO].
• If a high temperature is reached inside the camera during movie recording,
the recording may be terminated to protect the camera circuitry.