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。
If the preview AE lock button is kept pressed while shooting, it is possible to shoot repeatedly with the locked exposure value.
拍摄时，如果一直按住预景深自动曝光锁定按钮，相机就能以锁定的曝光值重复拍摄。
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