SIGMA DP3 Merrill - Manual (Page 37)

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For example, if you wish to change the ISO Setting to 400
1
Press the button to display Qs1.
2
Press the button to select the ISO
setting.
3
Press the button a few times, or rotate Command Dial to change
the ISO setting to 400.
4
By pressing or the shutter button halfway, the settings will be
applied and the camera will return to shooting mode.
CAUTION !!

The Flash Mode cannot be set while the camera does not attach to the
flashgun, or the flashgun is turned off.

It is possible to select the Color Mode to Sepia, only when the Image
Quality is set to JEPG (FINE, NORM., BASIC).

When the Color Mode is set to Sepia and Image Quaity is changed to
RAW or RAW+JPG, the Color Mode will be automatically changed to
STD.(Standard).

When you select (Custom) from [White Balance], the current
stored setting in [ Capture Settings] (P.28) → [White Balance] →
[Custom ] will be used.

It is not possible to capture a new custom white balance from
(Custom) in Quick Set Menu. Please capture a new custom white
balance by referring “SETTING A CUSTOM WHITE BALANCE” in P.64.