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。
The AE lock mode locks the exposure value for precise exposure metering.
自动曝光锁定模式能锁定精确曝光测定时的曝光值。
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。
Furthermore, with E-TTL II cameras, flash metering is no longer linked to the AF point you're using - this reduces exposure errors if you prefer to lock focus and re-compose.
另外，使用支持e-TTLII的相机时，闪光的测光不再与当前对焦点联动-这降低了锁焦和重新构图时发生曝光错误的机会。
Programmed auto exposure, Aperture Priority Auto and Shutter Priority Auto, Manual exposure. ; AE lock.
自动曝光，程序自动曝光P（可进行程序微调），光圈优先（A），快门优先（S），手动曝光（M）
Programmed auto exposure, Aperture Priority Auto and Shutter Priority Auto, Manual exposure. ; AE lock.
自动曝光，程序自动曝光P（可进行程序微调），光圈优先（A），快门优先（S），手动曝光（M）
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