I am not sure about that.

來源: 於 2012-03-02 14:47:03 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：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.

☆ 發自Android 文學城閱覽器 4.0.11