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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: Autofocus/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, flash exposure compensation, etc. Effective when
you prefer to control the exposure in less fine increments than 1/3-stop
increments.
C.Fn-2 ISO expansion
0: Off
1: On
For the ISO speed, “H” (equivalent to ISO 12800) will be selectable.
Note that if [C.Fn-6: Highlight tone priority] has been set to [1:
Enable], “H” cannot be set.
C.Fn-3
Flash sync. speed in Av (Aperture-priority AE) mode
When you use flash in the aperture-priority AE mode (Av), you can set the
flash sync speed.
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. With an external Speedlite, high-
speed sync is also possible.
1: 1/200-1/60 sec. auto
Prevents a slow shutter speed from being set in low-light conditions. It is
effective for preventing subject blur and camera shake. However, while
the subject will be properly exposed with the flash, the background may
come out dark.
With setting 1, the exposure level will be displayed in the viewfinder and on
the LCD monitor as shown below.