首先，要了解光圈參數是如何計算的， fstop=鏡頭焦距長度/光圈的有效直徑; 然後你想想長焦鏡頭用大口徑光圈的代價？

來源: 移花接木於 2023-01-16 18:18:21 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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