SIGMA DP3 Merrill - Manual (Page 51)

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2. Set the lens to MF mode and focus manually.
SETTING THE FOCUS FRAME
The DP3 Merrill is equipped with two focusing modes. When using the
“9 points select mode” it is possible to choose the desired focusing point
from 9 different frames. When using “Free move mode” it is possible to
move the desired point as you like. In addition, you can choose the
size of the Focus Frame from three types [Spot], [Regular], [Large].
9 points select mode Free move mode
Focusing point moving area
Spot
Regular
Large
How to set：
Press the button.

[9 points select mode] and [Free move mode] will be switched back and
forth each time the
button is pressed.

When [9 points select mode] is selected, choose the desired focusing
point by pressing the
buttons.

When [Free move mode] is selected, move the focusing point as you like
by pressing the
buttons (focusing points can be moved inside the
focusing point moving area).

When the Command Dial is rotated, you can change the size of the Focus
Frame.
Confirm by pressing the button.