是呀所以人家用600mm f/4而不是諸如150－500mm f/6.3之類。

來源: 用戶名被占用了於 2013-01-04 11:12:32 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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是呀 所以人家用600mm f/4而不是諸如150－500mm f/6.3之類。