Pentax Silkypix K-500 Operating Manual page 137

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Use the four-way controller (23) to select Q or R, and
press the 4 button.
Uses Movie Shake Reduction. (default setting)
Q
Does not use Movie Shake Reduction.
R
12
Press the 3 button.
The camera is ready to record a movie.
The settings described in this section can also be set through the control panel.
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