SIGMA DP3 Merrill - Manual (Page 84)

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FLASH EXPOSURE COMPENSATION
It is possible to compensate the flash output level without changing
the background’s exposure.
The Flash Exposure Compensation can be set from [ Capture
Settings] (P.28) → [Flash] → [Flash Exposure Compensation].
Select the desired compensation value by using the
buttons.
● Flash Exposure compensation can be set in 1/3 stop increments from
+3.0 to -3.0 stops.
● When the Flash Exposure Compensation is set,
the icon and compensation value will be
displayed on the left of the LCD monitor.
CAUTION!!

The flash exposure compensation can not be set if the flashgun is
not attached to the camera, or the flashgun is turned off.

The flash exposure compensation will not disable automatically.
After taking the picture, set the compensation value to ±0.0 by
above procedure.