Fred Miranda comparison confirms DXO results. 5D III blown away.

Started Apr 26, 2012 | Discussions thread
John Sheehy
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Re: Old news
In reply to stephenmelvin, Apr 27, 2012

stephenmelvin wrote:

Thing is, the DR advantage of the D800 goes away rapidly as the ISO goes up. It's about 2 1/2 stops at ISO 100, but by ISO 160, it's under two stops (9.12 vs 10.84). At ISO 320, the advantage is about a stop (8.89 vs 9.95) and by ISO 1280, they're practically the same.

You're overlooking the real meaning, and concentrating on trivia. DR is not a direct issue at high ISOs, per se. High-ISO DR is a red herring, when the absolute read noise is basically the same at all ISOs. That is because high ISOs are basically just a routine of clipping away the sensor's highest tones.

The overwhelming fact is that if you shoot at an exposure index of ISO 3200 from an ISO setting of 100 on both a D800, and a Canon DSLR, you get a reasonable ISO 3200 image after processing on the D800, and worthless garbage on the Canon, with 6x as much read noise.

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John

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