右侧是在f/2.8的光圈拍摄的：火炬灯为焦点，但是背后的房屋和树已经模糊得难以辨认了，这就是浅景深。
The right side, on the other hand, was shot at f/2.8: The torch is in focus, but the trees and the house are melted beyond recognition.
仔细观察一下这张有一盏落地式火炬灯的照片，左侧是在f/22的光圈拍摄的：火炬灯为焦点，你可以看出背景中的树木和房屋，这就是我们说的大景深。
The left side was shot at f/22: The torch is in focus, and you can make out the tree and the house behind it. That's a large DOF.
高功率LED闪光灯电流源有闪光、火炬和协助光模式。
The high power LED flash current source can operate in flash, torch, and assist light mode.
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