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我们在观看广告照片时经常会发现这样的现象：有的照片从很近的景物到很远的景物都非常清晰，而有的照片中除了被摄主体清晰外，主体稍前或稍后的景物都模糊。为何照片的清晰范围会产生如此大的不同？拍摄时如何控制被摄体的清晰范围？这便是我们现在讨论的主题──景深的控制?
When we watch advertising photos often find this phenomenon: some photos from very close to the scene scenery is very clear, and some photos in addition to the subject clear, the main body before or after the scene All fuzzy. Why is the difference in the clear picture of the picture so different? How to control the clear range of the subject when shooting? This is the subject we are discussing now ─ ─ depth of field control?