Pentax K-X - Manual (Page 160)

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1
Set the mode dial to a.
2
Set the shutter speed and aperture value to obtain the
proper exposure.
Set 1/180 sec. shutter speed or slower.
3
Press the K/i button.
The built-in flash pops up.
In a (Manual) mode, you can raise the built-in flash at any time prior to
shooting.
4
Take a picture.
Trailing Curtain Sync discharges the flash immediately before the shutter
curtain closes. When shooting moving objects with a slow shutter speed,
Trailing Curtain Sync and Slow-speed Sync produce different effects
depending on when the flash is discharged.
For example, when shooting a moving car with Trailing Curtain Sync,
trailing light is captured while the shutter is open and the flash captures the
car immediately before the shutter is closed. Therefore, the picture will
include a sharp, well-lit car with trailing lights behind it.
Using a Mode
Using the Trailing Curtain Sync
Slow-speed Sync Trailing Curtain Sync