22C-D022H103

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照片锐度很大程度上取决于镜头本身的素质，不过如果你只是希望获得某支镜头佳的锐度，我们就要讨论一下“正确地”使用镜头的问题。

关于锐度，重要的一点是要明白，对镜头的锐度并非始终一致的：

中心与边缘：基本的规律是镜头中心锐度高，向边缘逐渐降低。画面的四角由于距离中心远，一般锐度低。

变焦范围：一支变焦镜头在不同焦段的锐度也不相同。问题是你很难知道在哪段焦距其锐度高。有些镜头在两端焦距锐，说明设计师更关注镜头在两端焦距的表现；其他镜头则在焦距中端锐度高。

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