[閒聊] A光圈與B光圈差了幾檔 (stops)
爬文了一下好像沒人說過怎麼算，所以小小的討論一下，
白話來說只要去算2^( stop) = ( A / B)^2 就好，
範例：F4.8和F5.6差幾檔？
首先( 5.6/ 4.8)^2 = 1.3611 // Note:這邊表示相同曝光量下快門時間可以差了1.3611倍
接下來 log( 1.3611) / log( 2) = 0.4448
這邊要注意的是Ｆ4.8和F5.6是近似出來的值，
所以算出來的檔位也不一定會落在1/3、1/2這種漂亮的間隔上。
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◆ From: 174.6.56.127
※ 編輯: DennisTang 來自: 174.6.56.127 (04/19 16:40)
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