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CFn AFassist beam firing

• RepairSurge Auto Repair Software

This function allows you to control whether the Rebel XSi/450D's built-in or an accessory EX Speedlite's autofocus-assist light is used to help the camera's autofocus system establish focus. The AF-assist beam speeds up and ensures sharp focus in low-light or low-contrast scenes where you want to use the flash. Here are the options and a description of each one:

♦ 0: Enable. This option allows the AF-assist beam from either the built-in flash or a Canon Speedlite mounted on the camera to help the camera focus. Enable is the default setting for the Rebel XSi/450D.

♦ 1: Disable. If you choose this option, neither the built-in flash nor the Speedlite AF-assist beam lights to help establish focus. While this option is useful in shooting situations where the AF-assist light may be annoying or intrusive, it may be difficult to establish accurate focus in low-light scenes.