D3 sensor efficiency

Started Nov 18, 2007 | Discussions thread
Bill Janes Senior Member • Posts: 1,848
Re: D3 sensor efficiency

DuncanM1 wrote:

I have calculated preliminary gain values for the Nikon D40X:

Full well = 55700e
ISO100 IG =
IS0800 IG = 1.63
ISO 100 read noise =
ISO800 read noise = 9e

I have to recheck my figures and do some plots for ISO200, 400 and
1600, but this seems like a very efficient sensor.

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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