Pentax K20D - Manual (Page 141)

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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.
1 Set the mode dial to any mode other than B or M.
2 Press the { button and press the four-way controller (3).
3 Select I or k and press the 4 button.
4 Press the K button.
5 Take the picture.
Using Trailing Curtain Sync
Trailing curtain sync slows the shutter speed. Turn off the Shake Reduction
function and use a tripod to avoid camera shake.
Slow-speed sync Trailing curtain sync