Custom Functions enable you to customize camera controls and operation to better suit your shooting style and to save you time. Once you set a Custom Function option, it remains in effect until you change it. Some Custom Functions are useful for everyday shooting, while others are for specific situations. For example, C.Fn-2: Long exp. noise reduction detects noise in long-exposure images and takes a second image to subtract out noise from the image.
Canon refers to Custom Functions by using the abbreviation C.Fn-[number].
The EOS Digital Rebel XTi/400D offers 11 Custom Functions. You should carefully evaluate each function before changing it.
To change a Custom Function, follow these steps:
Press the Menu button and select the Tools 2 tab.
Press the down cross key to select Custom Functions (C.Fn).
Press the Set button. The Custom Function screen appears.
Press the left or right cross key to select the Custom Function number that you want to change.
Press the Set button.
Press the up or down cross key to select the Custom Function option number.
Repeat steps 4 through 6 to change other Custom Functions. The new Custom Function settings remain in effect until you change them.
When you're finished, press the Menu button to return to the menu.
The EOS Digital Rebel XTi/400D offers the following Custom Functions:
C.Fn-1: SET button/Cross keys funct. Allows you to change the function of the SET button and cross ...