Most of Canon Speedlites flashes have quite nice built-in AF-assist LED lights, which would are useful in low-light situations, even when one doesn't want to use flash in photos.
Is there any way to set the flash (or camera) to fire only AF-assist, and not the flash itself? Only way I know is to prefocus and then turn off the flash, which is not very practical.
Answer
Disable the flash in the camera settings. It still uses the AF-assist beam, but it will not fire the flash.
The setting is in different places depending on the camera, for example:
EOS 5D:
Menu > Custom Functions > 07
EOS 5D mk II:
Menu > Tools 3 > External Speedlite control > Flash function settings > Flash firing
EOS 550D / Rebel T2i / Kiss X4: Menu > Camera 1 > Flash control > Flash firing (it also works for built-in flash)
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