Sigma sd Quattro, Руководство пользователя

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SETTING THE FLASH MODE
Some items of the external flash can be set from the camera side.
The Flash Mode can be set by [ Capture Settings ] (P.30)
→
[ Flash ].
RED-EYE REDUCTION FLASH (Red-eye)
When taking a picture with flash, sometimes the person’s eyes reflects the
flash light and the “redeye” phenomenon will appear in the picture. In order
to avoid this effect, the light flashes for about one second before the picture
is taken to reduce the effect of red-eye.

Depending on the lighting and subject conditions, the Redeye Reduction
flash may not completely eliminate the redeye in all cases.
REAR CURTAIN SYNCHRONIZATION (Rear Curtain Sync.)
When you use rear curtain synchronization, the flash will fire just before the
rear curtain begins to close and the subject will be exposed by ambient
light from the time the shutter opens until the flash fires. As a result the
furrow of the subject will be recorded behind the subject. This gives a more
natural effect.
FP FLASH FUNCTION (FP)
The FP flash keeps firing, while the shutter curtain is running. Thus you can
use a shutter speed faster than the synchronized speed.
SLOW SYNCHRO MODE (Slow Sync.)
When using the flash with P/A mode, the shutter speed value, which will
reduce camera shake, is set automatically. The slow synchro mode
changes the shutter speed up to 30 second depending on light condition.
This mode is suitable for a portrait in a nightscape.
AF ASSIST LIGHT (AF Assist Light)
Normally, the AF Assist Light integrated in the Flash, lights up during
shootings with the flash. When the AF Assist Light prevents appropriate
shooting, selecting [ Off ] from [ AF Assist Light ] can set the AF Assist Light
to be turned off during shooting.