Canon Speedlite 320EX Instruction Manual - Page 24

AF-assist Beam When autofocus cannot achieve focus on the subject in low-light conditions, the AF-assist beam activates automatically. AF-assist Beam Using Continuous Flashes When autofocus cannot achieve focus on the subject in low-light conditions while taking pictures using the viewfinder, pressing the shutter button halfway fires the flash continuously to assist autofocus. The flash also fires continuously under the same conditions when AF mode is set to [Quick mode] during Live View shooting or movie shooting. The effective range is approximately 4 m / 13.1 ft. This function only works when used with an EOS digital camera with an external Speedlite control function. Depending on the camera model, the firmware of the camera may need to be updated. AF-assist Beam Using the LED Light The LED light can be used as the AF-assist beam when the AF mode is set to [Live mode] or [uLive mode] during Live View shooting or movie shooting. The effective range is approximately 4 m / 13.1 ft. (With f/1.8 lens at ISO 3200) Manual light button Manual light Auto light LED light switch Manual light Set the LED light switch to and press the button until the LED light turns on. The LED light will turn off after about 60 minutes of idle use. To turn off the LED light, press the button until the LED light turns off. The Speedlite does not fire when the LED light is turned on. 22