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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, 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
Enables ISO 6400 and H (equivalent to ISO 12800) to be set.
C.Fn-3 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: 1/200-1/60 sec. auto
When flash is used with aperture-priority AE (f), this prevents a slow
flash-sync speed from being set automatically 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
will come out dark.
2: 1/200 sec. (fixed)
The flash-sync speed is fixed to 1/200 sec. This more effectively
prevents subject blur and camera shake than with setting 1. However,
the background will come out darker than with setting 1.
The exposure level will be displayed in the viewfinder and on the LCD
monitor as shown below.