An in-depth guide to using this impressive camera, with hints and tips on how to get the very best from its many functions The D800 is the biggest news to emerge from Nikon since 2008, when they introduced their last all-new full-frame DSLR, the D700. The D800 is not a replacement for the D700, but rather it is a new model in its own right—complementary or alternative to Nikon's own new professional camera, the D4, but at half the price.