SIGMA DP3 Quattro - Manual (Page 67)

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SETTING THE SENSITIVITY (ISO EQUIVALENCY)
The photosensitivity of digital cameras is
described in terms of “ISO equivalent” like
silver-halide film cameras.
The ISO Sensitivity can be set in Quick Set Menu (P.34) or [ Capture
Settings] (P.27) → [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 changed to M
mode, images are taken at the lower limit set in the next section [ ISO
AUTO RANGE].
ISO AUTO RANGE
It is possible to set the Lower limit and
Upper limit of the ISO Sensitivity in ISO
Auto mode.