SIGMA DP3 Merrill - Manual (Page 74)

73
EXPOSURE COMPENSATION
If you want to intentionally overexpose
or underexpose the picture, use this
function.
Select the desired compensation value
by using the
buttons.
 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 pressing
button.

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.