Canon EOS Rebel T3 18-55mm IS II Kit Instruction Manual page 217

Custom Functions
C.Fn I: Exposure
1 Exposure level increments
2 Flash sync. speed in Av mode
C.Fn II: Image
3 Long exposure noise reduction
4 High ISO speed noise reduction
5 Highlight tone priority
C.Fn III: Autofocus/Drive
6 AF-assist beam firing
* If you use an EX-series Speedlite (sold separately) equipped with a LED
light, the LED light will turn on for AF-assist even in the d and c
modes.
C.Fn IV: Operation/Others
7 Shutter/AE lock button
8 Assign SET button
9 Flash button function
10 LCD display when power ON
The shaded Custom Functions do not take effect during Live View (LV)
shooting. (Settings are disabled.)
3 Setting Custom FunctionsN
A LV shooting
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