Custom Function Settings; C.fn I: Exposure; Exposure Level Increments; Flash Sync. Speed In Av Mode - Canon EOS REBEL XS EOS REBEL XS Instruction Manual

Custom Function SettingsN
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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.

C.Fn I: Exposure

C.Fn-1
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.
The exposure level will be displayed in the viewfinder and on the LCD
monitor as shown below.
C.Fn-2
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.)
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Exposure level increments

Flash sync. speed in Av (Aperture-priority AE) mode