在物理镜头系统中，光圈调整光线进入系统的数量极限。
In a physical lens system, the aperture is adjusted to limit the amount of light entering the system.
这种模式需要较充足的光线，并且你不能在拍摄的时候调整光圈。
This mode needs a lot of light, and you can't adjust the aperture yourself.
白平衡的功能是调整色彩，使白色在任何光线条件下都能被记录为白色。
This function adjusts colours to ensure that white is recorded as white under all lighting conditions.
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