SIGMA DP3 Quattro - Manual (Page 68)

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1
Select [ Capture Settings] (P.27) → [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.34), 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.)
2
Set [ Lower limit] and [Upper limit].
Lower limit
ISO 100 (Default) ISO 400
ISO 200
Upper limit
ISO 200 ISO 1600
ISO 400 ISO 3200
ISO 800 (Default) ISO 6400
CAUTION !!

It is not possible to set the same value to the Lower limit and Upper limit
and reversed value.
By default, the ISO sensitivity step setting is 1 EV. However, it is
possible to select 1/3 EV.
It is possible to set the ISO sensitivity from [
Capture Settings] (P.27)
→ [ ISO Sensitivity Step].
1 EV (Default) It is possible to set the ISO sensitivity step 1EV.
1/3 EV It is possible to set the ISO sensitivity step 1/3EV.