他只知道是不是有足够的光线进入相机来完成曝光。
All it knows is whether the right amount of light is getting inside the camera for a proper exposure.
这样的照片只需要一把手电筒和一些特殊工具就能完成，海明威在他的三脚架上选取好拍摄场景，将相机设置成长曝光模式，然后手里拿着手电筒在镜头里随意舞动。
With a flashlight and some special tools, Hemingway can frame his shot on a tripod, set a long exposure and dance through the shot with his lights in hand.
这些控制允许你轻松地调整闪光灯和相机曝光，不过主要工作仍然交由ttl系统完成。
These controls allow you to make easy adjustments to flash and overall exposure while still letting the TTL system do most of the thinking for you. Very handy indeed.
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