Set your camera to its lowest aperture value (completely open).

将你的相机光圈开到最慢（完全打开）。

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Set the lens aperture to the aperture value designated by the flash unit according to the ISO setting your camera.

按照您相机上闪光装置ISO设置，设置好镜头的光圈大小。

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In the same aperture value, I have found that the sky needs four seconds shutter time, but 40 seconds for the sea level.

在一样的光圈值，我测得天空需要4秒的快门时间，但海面需要40秒。

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Because settings such as the aperture value or exposure compensation can be quickly adjusted with a twist of the control ring, users can capture photos exactly the way they want without missing a shot.

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