然后你有大约16秒时间重新构图进行拍摄，闪光灯的曝光量将保持在锁定值，不会因重新构图后曝光量改变而破坏拍摄结果。
You then have about 16 seconds to recompose and take the shot thereby guaranteeing the exposure you set and not have the camera reset a new exposure ruining your shot.
就是先获得恰当的闪光曝光值，压下闪光曝光锁按钮，锁定这个曝光值。
FE lock is simply obtaining a proper flash exposure, pushing the right button to lock in that exposure.
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