Hoya H01-201106 - Manual (Page 215)

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Trailing Curtain Sync discharges the 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.
Relationships among the guide number, aperture and distance must be
considered when shooting with the flash to obtain a correct exposure.
Calculate and adjust the shooting conditions if the flash output is not sufficient.
Using the Trailing Curtain Sync
Trailing Curtain Sync slows down the shutter speed. Use the Shake Reduction
function, or turn off the Shake Reduction function and use a tripod to avoid
camera shake.
Distance and Aperture when Using the Built-in Flash
Sensitivity
Built-in Flash
Guide Number
Sensitivity
Built-in Flash
Guide Number
ISO 125 Approx. 5.6 ISO 1600 Approx. 20
ISO 200 Approx. 7 ISO 3200 Approx. 28
ISO 400 Approx. 10 ISO 6400 Approx. 40
ISO 800 Approx. 14
Slow-speed Sync
(Leading Curtain Sync)
Trailing Curtain Sync