I did not know this

Started May 1, 2014 | Discussions thread
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Chikoo
Chikoo Senior Member • Posts: 1,630
I did not know this

Semi = 2/3 ???

"This Semi-transparent mirror is at the heart of Sony's SLT cameras. Light hits this mirror and approximately a third of the is sent upward to the AF sensor, while the rest continues on to the CMOS."

http://www.dpreview.com/previews/sony-alpha-slt-a77-ii/4

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