FE lock is simply obtaining a proper flash exposure, pushing the right button to lock in that exposure.
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。
The speedlight will pre-flash that area and lock that exposure into memory. I might caution you that you have 16 seconds to then recompose and take the shot.
闪光灯会预闪并把曝光值记忆下来，注意你只有16秒的时间重新构图拍摄。
I use this feature very often especially at weddings where you expose and lock the exposure then recompose and take the shot.
我经常使用这个功能，尤其是在拍摄婚礼时。
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