变焦镜头的倍数是怎么回事？ 变焦镜头倍数怎么算
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你后面一个问题2.5-215，这个镜头在广角端更广，等效焦距是14，长焦端是一样的，1200。不过这个镜头很难做出来。
变焦镜头是吧远处看不清楚的放大，就能看清楚了
倍数越大焦距越远，视角越窄
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