整本书分为三大主题：曝光的定义，特殊技巧，及胶片相机和数码相机的讨论。
The book is divided into these three topics, as well defining exposure, special techniques, and a discussion of film vs. digital.
文章结合实践介绍了应用数码相机拍摄教学挂图来解决这一问题的一些方法和技巧。
This paper introduces the methods and techniques to solve the problem by applying digital camera to take pictures of teaching wall maps.
这种技巧称为“最大光圈”，通过调整数码相机设置，让更多光线进入镜头，便可完成。
This is a technique called Maximum Aperture, and is done by adjusting the Settings on your digital camera to let more light pass through the lens.
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