How does the D3 achieve such high ISO?

Started Feb 17, 2008 | Discussions thread
ejmartin Veteran Member • Posts: 6,274
1D3 full well?

Marianne, where are you getting your figure of 22K electrons at saturation for the 1D3 at ISO 200? Mine has 71K electrons at saturation for ISO 100 and about 38K at ISO 200. 22K seems awfully low, more like the value for the 1D2.

As for the change in Clark's data, he had measured the gain at ISO 50, not realizing that ISO 50 is really ISO 100 overexposed by a stop. So values for gain above ISO 50 are double what he intially reported, and read noise in electrons consequently also doubled for all ISO's above 50. (There was clearly a problem, since if you took the original figures seriously, the 1D3 had the worst photon collection efficiency of any Canon DSLR since before the 10D).
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emil
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http://theory.uchicago.edu/~ejm/pix/20d/

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