对于一个相机的使用者,不用了解那么多物理知识,什么物距、像距跟我有半毛钱关系啊。无需语言,看图。要相机收录3.5米宽的街道和人,你要是胆大敢离2.1米就选21mm镜头,你要是胆小就选50mm米在5米处拍吧。
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