Just a wonder question. Was the D4 introduced after the D3? If so, why did they reduce the number of pixels? I would have expected them to go the other way. Is there something gained from going to fewer pixels?
The D3 was introduced in 2007, it was a 12mp camera. The D4 was introduced in 2012, it is a 16mp camera.
Perhaps you're thinking of the D3x? That's a 2009 model, with 24mp. But it's slower frame rate, etc, probably due to the output capabilities in getting the greater amount of data through the entire system onto the CF cards. The kind of successor to the D3x is the D800.
_____ Brian... a bicoastal Nikonian and Team Member
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The D4 was introduced after the D3. The MP's have been increased from 12Mp on the D3 to 16Mp on the D4.
You are probably looking at the D3x, which is a 24Mp camera. That was introduced after the D3 as a high resolution camera aimed primarily at portrait and landscape work. It traded higher Mp for reduced low light capability and slower burst rates.
The D3x is still an active Nikon product. The D3 and D3s (which was an enhanced D3 but also still 12Mp) are discontinued.