SIGMA DP1 - Manual (Page 62)

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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.
1
Press the button to open [ Shooting Menu].
2
Use the buttons to select [Auto Bracket] and press the button.
3
Use the buttons to set the bracketing amount. (It can be set in 1/3 stop
increments up to ±3)
4
Press the button or the button to apply the settings or the
button to close the sub-menu without making any changes.
ŠThe camera will take three pictures in the following sequence; Appropriate
exposure, under exposure and over exposure.
ŠThe exposure bracketing can be used with 4 different modes.
P Mode ; Both shutter speed and aperture value will be changed.
A Mode ; Only shutter speed will be changed.
S Mode ; Only aperture value will be changed.
M Mode ; Only shutter speed will be changed.