SIGMA DP3 Merrill - Manual (Page 67)

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Set [Lower limit] and [Upper limit].
Lower limit
ISO 100 ISO 400
ISO 200 (Default)
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.28) → [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.
When the 1/3 EV is selected, the following ISO sensitivity can be set.
ISO AUTO ISO 250 ISO 800 ISO 2500
ISO 100 ISO 320 ISO 1000 ISO 3200
ISO 125 ISO 400 ISO 1250 ISO 4000
ISO 160 ISO 500 ISO 1600 ISO 5000
ISO 200 ISO 640 ISO 2000 ISO 6400