指根据景物的亮度和记录表现景物的需要，来选择恰当的光圈与快门组合，正确记录景物的影像于感光片之上。
这是因为他们依赖相机实现正确曝光。
This is because they are relying on their camera to achieve the correct exposure.
包围曝光是在技术上帮助摄影师获得正确曝光的图像。
Exposure bracketing is a technique used by photographers to help ensure they capture a correctly exposed imaged.
这对主体正确曝光而言就可能会产生错误的闪光输出；
This may result in an erroneous flash power setting for getting a correct exposure of the main subject.
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