SIGMA DP3 Quattro - Manual (Page 71)

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ASPECT RATIO SETTING
Aspect Ratio of the image can be changed.
Aspect Ratio Setting can be set in Quick Set Menu (P.34) or [ Capture
Settings] (P.27) → [Aspect Ratio].
21:9
Aspect Ratio similar to those of wide screens used in
cinema.
16:9 Aspect Ratio the same as those of high vision TVs.
3:2 (Default) Aspect Ratio the same as those of 35mm film cameras.
4:3
Aspect Ratio the same as those of traditional TVs and PC
screens.
7:6 Aspect Ratio is the same as those of 6x7 film cameras.
1:1 Aspect Ratio is the same as those of 6x6 film cameras.

Each image of Aspect Ratio is made by cutting images of this camera’s
standard Aspect Ratio 3:2.
TIP

Images recorded as RAW format can be changed to different ratio in
SIGMA Photo Pro.
When shooting with aspect ratio other
than 3:2, the frame is normally displayed
in black. By making it semi-transparent, it
is possible to use it as a sports finder
which allows users to check the
surrounding areas of the image.
Select the setting from [ Camera Settings] (P.27) → [Outer Frame
Display].
Black (Default) Frame is displayed in black.
Semi-transparent Frame is Semi-transparent.