Sigma SD15 User Manual page 51

Digital single lens camera with foveon full color sensor
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SLOW SYNC
OFF
(Default)
ON
REAR CURTAIN SYNCHRONIZATION (Flash Sync. Mode)
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.
(Default)
Default setting is applied.
Please use this mode for ordinary photography.
Slow synchro mode is applied.
Default (Front curtain synchronization) mode is applied.
Please use this mode for ordinary photography.
Rear curtain synchronization mode is applied.
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.
When you photograph a moving subject with
slow synchronization, usually the furrow of
the subject will be exposed in front of the
subject. The ordinary flash light will fire when
the front shutter curtain is fully opened, thus
the subject will be exposed from the time the
flash is fired to the time the shutter is closed
(Front curtain synchronization). When you
use rear curtain synchronization, the flash
will fire just before the rear curtain begins to
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