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Custom Functions are organized into four groups based on the function
type: C.Fn I: Exposure, C.Fn II: Image, C.Fn III: Auto focus/Drive, C.Fn
IV: Operation/Others.
3 Custom Function SettingsN
C.Fn I: Exposure
C.Fn-1 Exposure level increments
0: 1/3-stop
1: 1/2-stop
Sets 1/2-stop increments for the shutter speed, aperture, exposure
compensation, AEB, etc. Effective when you prefer to control the
exposure in less fine increments than 1/3-stop increments.
C.Fn-2
Flash sync. speed in Av (Aperture-priority AE) mode
0: Auto
The flash sync speed is set automatically within a range of 1/200 sec. to
30 sec. to suit the scene’s brightness.
1: 1/200 sec. (fixed)
If you use the <f> mode (aperture-priority AE) for flash photography,
the shutter speed will be set to 1/200 sec. You need not worry about
camera shake.
(However, night scene or dark backgrounds will look darker in this
mode.)
The exposure level will be displayed in the viewfinder and on the LCD
monitor as shown below.