OM-D E-M5 Raw Files

Started Feb 15, 2012 | Discussions thread
bg2b
Contributing MemberPosts: 897Gear list
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Re: I have a question
In reply to buddika, Feb 16, 2012

That's determined by the maximum value possible in a RAW file (about 4000 for the 12-bit files that Olympus uses). DxO style stops of DR = log2((max value-offset)/(std dev of black pixel values)). The offset is the average value of a black pixel.

For the E-M5, that's log2((4095-256)/s), where s seems to be in the range of 1.1 to 1.2.

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