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It's official: my D7000 consistently underexposes!

elec164

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"RE: It got this one right yesterday morning"

elec164 Silver Member Nikonian since 15th Jan 2009
Tue 15-Feb-11 03:30 PM

You would need to load the image into an editor by either copying from the screen or saving a copy of the image to your computer.

Having said that I am not sure how Len’s sample fits into the gist of the thread as I understand it. The issue is whether the D7000 has a tendency to underexpose in general circumstances thereby increasing the appearance of noise. Even if the sample provide by Len is a direct CNX2 conversion of the NEF without any further editing other than resizing, it does not in itself tell us much. The down sampling would diminish if not eliminate much of the apparent noise, not to mention the severe JPEG compression artifacts in the areas one would need to examine for the noise issue. And analyzing a PP JPEG or TIFF is not an indicator of whether the clipping or blocking was due to PP or sensor site saturation. The only way to know for sure would be to analyze the raw data.

As I understand it there are two main sources of noise in general exposures and that is read and shot noise. Read noise is the base level for SNR and is the predominant source of shadow noise. It is fairly constant and is more apparent in high ISO images. Although technically sensors are linear devices, the response of sensel sites to photon collection is not. So in underexposed images shot noise becomes the predominate issue which generally appears in same color or fine gradient areas such as the sky. So if we were given a 100% crop of Len’s sample image of the sky area, it might give an indication if the image was underexposed then recovered in PP by the appearance of a more significant amount of shot noise.

And I believe this is the source of Ann’s issue. If the D7000 matrix metering in AF-S has a tendency to underexpose, but then using its Expeed PP to recover proper tonality later, then the shot noise could very well be the source of her images being turned down by her Stock Agency. For the rest of us that amount of noise would not be problematic in most circumstance we would use the image for. But a Stock Agency needs to have a much higher standard not knowing to what use the image will be put to.

Pete

Pete

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This is a hot, active topic! It's official: my D7000 consistently underexposes! [View all] , waxart , Wed 19-Jan-11 04:27 PM
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