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.
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