SIGMA DP3 Merrill - Manual (Page 66)

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The ISO Sensitivity can be set in Quick Set Menu (P.35) or [
Capture
Settings] (P.28) → [ISO Sensitivity].
ISO Auto (ISO AUTO) (Default) ISO 800
ISO 100 ISO 1600
ISO 200 ISO 3200
ISO 400 ISO 6400
CAUTION !!

When Exposure Mode is set to M mode, it is not possible to select
[ISO Auto]. When AUTO is selected in S, A, P mode and then
change to M mode, ISO200 will be applied.
ISO AUTO RANGE
It is possible to set the Lower limit and
Upper limit of the ISO Sensitivity in ISO
Auto mode.
1
Select [ Capture Settings] (P.28) → [ISO Sensitivity] → [ISO
Auto], and press the button to move the ISO Auto Range setting
screen. (When the
button is pressed after selecting [ISO Auto], the
current setting will be applied).
When the ISO Auto Range is set in the Quick Set menu (P.35), select
[ISO AUTO] and press the
button to display the ISO Auto Range
setting screen. (By pressing the button or the shutter botton halfway
after selecting [ISO AUTO], the current setting will be applied.)