The Nikon D3 is the full-sized professional version of the D300. It features Nikon’s first full size FX sensor, so there is no more need to deal with a lens multiplication factor. In addition, it features dual Compact Flash II (CFII) slots, a 3-inch VGA quality screen, 51-point auto focus, 9 frames per second continuous and ISO up to 6400. If you want to use the exact camera that the pros use, this is the one from Nikon. The D3 also has a self-cleaning sensor.