D3 sensor efficiency

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

Hmmm. I suppose I'll have to make time to analyze the D200 test
images I have. I suspect the same issue I am harping on may afflict
Clark's measurements as well, though I don't know for sure. He
simply states that the analysis he uses is the same as he used for
the Canon 1D2, ie subtracting two bias frames and measuring the
standard deviation. That will under-report the read noise for the
reasons stated in my previous post. Clark makes no mention of any
compensation for clipping of the blackframe noise.

When I measured the readnoise, I simply measured one bias frame, then the other, and reported the higher of the two values. subtracting the bias frames from each other, gives a read noise of 14 to 15e.


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