It seems (though I am not quite certain) that Nikon has designed its own sensor for the new D3100, rather than using a Sony sensor. It seems not to be the 14MP Sony Exmor HD of the NEX models, despite very similar spec's. Nikon suggests so at its website, saying "A new DX-format CMOS image sensor developed by Nikon" at http://www.nikon.com/about/news/2010/0819_d3100_01.htm and some spec's and images of the sensors are a bit different.If so, that is a big step beyond Nikon designing its own sensors only for some low volume high end models (D700, D3s), and could have quite an impact on economies of scale for Sony's DSLR sensors, unless NEX considerably boosts Sony's share of "interchangeable lens camera" sales.
If so, that is a big step beyond Nikon designing its own sensors only for some low volume high end models (D700, D3s), and could have quite an impact on economies of scale for Sony's DSLR sensors, unless NEX considerably boosts Sony's share of "interchangeable lens camera" sales.