Here we go again with the same discredited arguments ...I, for one, can't take DxOMark seriously or trust any of their numbers when they...
* Rank $40,000 medium format digital backs lower than consumer APS-C DSLRs.
There's nothing necessarily "wrong" with this per se. A medium format back is not necessarily better as a general purpose camera than an APS-C camera.
You know darn well their scores do not reflect how good the camera is as a "general purpose camera."
I doubt that anyone is seriously using the website to decide whether to choose an APS-C or a MF back, so this argument is a silly red herring (usually trotted out by camera "fans" of low scoring cameras)
It's not relevant whether or not people are looking to them, and this is not a red herring. Their scores are consistently presented by them and others as IQ scores, yet their methodology is obviously flawed if they can give a consumer APS-C sensor a higher IQ score than a MFDB. This obvious error is usually ignored by "fans" of high scoring cameras. When a "fan" wishes to compare, say, Canon and Nikon, then all of a sudden the score is a score of overall IQ that we all must concede. When the same "fan" is confronted with the fact that the score for a consumer DSLR is higher than a 40 MP MF back, all of a sudden the score isn't a score of overall IQ, and nobody is using those scores to begin with, and stop tossing out red herrings.
Which is it?
This horse has been beaten to dust. They report 13.2 bits for each pixel. You can gain dynamic range by downsampling. 14.4 stops is based on downsampling to 8mpx.
You cannot gain dynamic range by down sampling because you throw away detail with noise. If you think you can, your definition of DR is flawed.
Quote* Report values for dynamic range that I know to be false from both personal experience and testing. (They rank the 10D, 20D, and 7D about the same. The 7D is a good 2 stops better.)
You keep saying that these are "about the same", and I keep calling you on it. They are not "about the same".
They show a 0.7 stop difference when it's roughly 2 stops.
For all the critics of DxOMark critics, I would like to point out that no less a professional and respected figure than Michael Reichmann stopped using DxOMark because of the obvious errors he observed in their results.
What precisely are his criticisms ? What exactly are his credentials as far as engineering and benchmarking are concerned ?
Visit his website.