It works by separating the mirror flip and aperture opening into two steps.

它将镜面翻转和光圈打开分为两个步骤。

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Each number does not necessarily correspond to a specific size of the aperture opening, but is a relative number.

每组数字并非是光圈打开大小的特定值，只是一个程度的相关体现。

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This is because you halved the amount of light being let through the aperture opening, but let in twice as much light by keeping the shutter open longer.

这是因为前一组你用了一半的光圈，而后一组用了一半的快门时间。

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They do that with a conventional camera by opening up the aperture of the lens and selecting a faster shutter speed.

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