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.
灯会预并把曝值记忆下来，注意你只有16秒的时间重新构图
摄。
,频放电管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.
灯会预并把曝值记忆下来，注意你只有16秒的时间重新构图摄。
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