SIGMA DP3 Quattro - Manual (Page 88)

88
WARNING !!

Please be aware that when you charge the external flash, the flash
mode icon will turn on and off. If you release a shutter during such time,
it will not flash and causes camera shake or underexposure.

When camera exposure mode P, A, or S is used, shutter speed can be
set up to 1/200 sec. (There is no limit when M mode is used.)

Flash photography can be used in the following range. ( P Mode)
ISO Flash Exposure Range
ISO100 Approx. 1m - 5m
ISO200 Approx. 1m - 7m
ISO400 Approx. 1m - 10m
ISO800 Approx. 1m - 14m
ISO1600 Approx. 1m - 20m
ISO3200 Approx. 1m - 28m
ISO6400 Approx. 1m - 40m
TIP

If the ISO sensitivity setting is set to [ ISO AUTO] and the external flash
is used, the value set in [ Lower limit] of [ISO Auto Range] will be
applied.
SETTING THE FLASH MODE
It is possible to select other flash modes such as Exposure Compensation
mode or Red-Eye Reduction mode.
The Flash Mode can be set in the Quick Set Menu (P.34) or [ Capture
Settings] (P.27) → [Flash] → [Flash Mode].
Normal Flash (Default)
Redeye
Slow Sync.
Redeye + Slow