D3 sensor efficiency

Started Nov 18, 2007 | Discussions thread
DuncanM1 Contributing Member • Posts: 817
Re: D3 sensor efficiency

You forget that the D3 has a base ISO of 200, versus 100 for the D40X. At ISO200, the D40X Well has about 27000, electrons or less than 1/2 of the D3. I measured multiple data points that were well away from saturation. The D40X full well size is proportionately the same as a 40D. I have confidence in my results since they are validated by the IR DR data, that I listed above, but I will attempt to refine them in due course.


EJ Martin has raised questions about your calculation of the read
noise, but I find that your determination of full well is
questionable, because your value is greater than Emil found for the
D3 whose pixel area is twice that of the D40x.

It is easy to overestimate the full well if over exposure results in
clipping of the noise. If you fully saturate the sensor the standard
deviation drops towards zero.
Bill Janes

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