D3 sensor efficiency

Started Nov 18, 2007 | Discussions thread
Bill Janes Senior Member • Posts: 1,848
Re: D200 read noise analysis-another view

DuncanM1 wrote:

Take, 2 Nikon bias frames, subtract one from the other, add an offset
to remove negative values, and then examine the histogram. The
resulting histogram seems perfectly Gaussian.



Yes, that is the method Roger Clark uses. It works well for the Canons, which don't clip the black point. Using Roger's method, I did get a distribution which was more or less bell shaped and thought I was using proper technique until Emil pointed out the problems. If you take a look at his web site, you will see that he is a professor of physics at the University of Chicago and has a better scientific background than most of us.

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Bill Janes

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