SIGMA DP3 Quattro - Manual (Page 76)

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EXPOSURE COMPENSATION
If you want to intentionally overexpose or
underexpose the picture, use this function.
Select the desired compensation value by
rotating the Rear Dial.

Exposure compensation can be set in
1/3 stop increments from +3.0 to -3.0
stops.
CAUTION !!

The exposure compensation will not disable automatically. After taking
the picture, set the compensation value to ±0.0 by rotating the Rear
Dial.

Exposure compensation function cannot be used with Manual
Operation mode.
AUTO BRACKETING
This function of the camera lets you take a sequence of pictures of the
same subject at three different exposure levels; Appropriate Exposure,
Under Exposure and Over Exposure. If it is difficult to determine the proper
exposure, please use this function.