Hello Giovanni, I borrowed a D3000 and was able to make some checks. It’s not a camera I’m very familiar with, but I used settings – manual, monochrome,ISO 100, NEF raw, auto white balance, standard picture,colour space sRGB,active D-lighting off, noise reduction off and shot a sequence of different exposures. You mentioned using AIP4Win so I did the same and set preferences for DSLR to debayer with camera white balance. Just plotted a few green channel points, but they look as I’d expect for raw image. Hopefully yours just a settings and not camera problem. As Nick suggests maybe a few of your raw NEF images plus settings summary would help resolve problems.
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