I am not sure about that.

来源: 于 2012-03-02 14:47:03 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

My memory says 70-200 f/2.8 at f/2.8 is not as sharp as 70-200 f/4 at f/4.

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