Book excerpt: Packed with everything you want and need to know in order to take amazing photos using your new Nikon D800 camera, this portable and full-color guide walks you through the controls, features, and functions of the D800 using step-by-step instructions and helpful examples. Veteran author J. Dennis Thomas shares full-color images of each menu screen and explains how to adjust white balance, autofocus, and exposure as well as how to choose lenses and adjust settings--