Pentax KC-01 - Using the Trailing Curtain Sync Flash

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Using the Flash
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Trailing Curtain Sync discharges a flash immediately before the shutter
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 light behind it.
Using the Trailing Curtain Sync Flash
Trailing Curtain Sync slows down the shutter speed.To avoid camera shake,
either set [Shake Reduction] to Q (On), or set it to R (Off) and use a tripod.
Slow-speed Sync
(Leading Curtain Sync)
Trailing Curtain Sync