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D3X features 24.5 megapixel, while the previous version only 12.5 megapixel. With the pixels of that of the D3X, then the resulting resolution will be larger. However, as the ability to process compensation in each of a second slower because of the large mega pixels.
One of the main features of the Nikon D3X is full TTL with Exposure Exposure APERTURE use 1005 pixels RGB sensor.
This camera is intended for the professional. However, among non-professionals who also love the camera like that, usually used for their hobby.