SIGMA DP3 Merrill - Manual (Page 76)

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WARNING !!

Once you set the auto bracketing mode, the camera will continuously
hold that auto bracketing mode until you set the bracketing amount to
“±0.0”.

Auto Bracketing functuion cannot be used with the flashgun.
■
Auto bracketing icon will change as follows depending on the frame
number.
First Frame Second Frame Third Frame
■
It is possible to change the Auto Bracketing Order.
The Auto Bracketing Order can be set in [ Capture Settings] (P.28)
→ [Auto Bracketing] → [Bracketing Order]
0 → - → +
(Default)
appropriate exposure → under exposure → over exposure
- → 0 → + under exposure → appropriate exposure → over exposure
+ → 0 → - over exposure → appropriate exposure →under exposure
Auto Bracketing mode can be used in combination with Exposure
Compensation.
You can take pictures with Auto Bracketing mode based on a
compensated exposure, which you set.
To do so, please set both the Auto Bracketing mode and Exposure
Compensation mode as desired.
The combined value (Exposure Compensation and Auto Bracketing) will
be indicated on the viewfinder display.
Example : Exposure Compensation +1.7 with Auto Bracketing amount 1.0
First Frame +1.7 (Exposure compensation +1.7 & no shift value)
Second Frame +0.7 (Exposure compensation +1.7 & shift value -1.0)
Third Frame
+2.7 (Exposure compensation +1.7 & shift value +1.0)