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。
Whether your camera is capable of Manual mode, or has one or two pre-flashes to set exposure, the Nano flash ensures correct exposure with all such camera types.
无论你的相机能够手动模式，或有一个或两个前闪光曝光设置的纳米闪存确保与所有这些相机类型正确曝光。
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