it’s been more than three years since Nikon set the D3s loose on the world. In that time, we’ve used one as a test body for numerous lens tests and have captured countless images that left us wondering what Nikon could do next with this line of cameras.Nikon’s response, the D4 ($6,000, street, body only), refines the D3s’s still image capabilities while adding state-of-the-art video capture with options to satisfy both casual and professional videographers. The sensitivity range has been