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f: Changing the Depth of Field
To obtain a correct flash exposure, the flash output will be set
automatically to match the set aperture (autoflash exposure). The
shutter speed will be set automatically between 1/200 sec. - 30 sec. to
suit the scene’s brightness.
In low light, the main subject is exposed with the automatic flash, and
the background is exposed with a slow shutter speed set automatically.
Both the subject and background look properly exposed (automatic
slow-speed flash sync). If you are handholding the camera, keep it
steady to prevent camera shake. Using a tripod is recommended.
If you do not want a slow shutter speed to be used, set [3: Flash sync.
speed in Av mode] to [1: 1/200-1/60 sec. auto] or [2: 1/200 sec.
(fixed)] in [7 Custom Functions (C.Fn)] (p.252).
The aperture opening (diaphragm) changes only at the moment when
the picture is taken. Otherwise, the aperture remains fully open.
Therefore, when you look at the scene through the viewfinder or LCD
monitor, the depth of field will look narrow.
When you press the depth-of-field
preview button, you can see the actual
depth of field before you shoot.
D Using the Built-in Flash
Depth of Field PreviewN
While looking at the Live View image (p.124) and holding down the depth-of-
field preview button, you can change the aperture and see how the depth of
field changes.