可愛小熊 wrote:
這是錯誤資訊不是30%
如果是30% EV就不會只降1/3.無奈
假設亮度 EV 10 降1/3EV
10 -0.33=9.67
9.67/10=96%透光率
如30%你就會像太陽眼鏡一樣看到很明顯的亮度差異
原文是正確的. dpreview的英文原本寫的很清楚. 30%的光會被反射上去用於對焦. 只有70%的光會射到CMOS上. sony是以提高ISO來補償進光不足的.
"According to Sony, it allows 70% of the light that strikes it straight through to the 16.2MP CMOS imaging sensor. The remaining 30% is reflected upwards to a large 15-point phase detection AF array.“
http://www.dpreview.com/reviews/sonyslta55/page2.asp
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