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CMS-XML How to use the AF-Assist Beam and what is its coverage on the 320EX Speedlite
The effective range is approximately 4 m 1 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 .
CMS-XML Added Control with Speedlite 470EX-AI's Personal Functions
Canon EOS cameras will turn the meter timer off (in other words, enter the first stage of “sleep”) typically after six seconds of inactivity, after the last button is touched. So if your viewfinder metering info goes blank, this continuous re-positioning of the 470EX-AI’s flash head likewise is halted. Just tap the shutter button once to wake it up again, and re-engage continuous updating of the motorized flash head, to preserve your initial bounce angle.