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
，
意你只有16秒的时间重新构图
摄。
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，意你只有16秒的时间重新构图摄。
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