David Busch's Compact Field Guide for the Canon EOS Rebel T3i/600D, from Cengage Learning, tells you the most essential facts about both the T3i and the 600D in a portable 144 pages. Take the guide with you on shoots and pull it out when you need clarity or a reminder of what exactly your camera can do. Filled with diagrams, full-color images, and clearly written instructions and explanations the Compact Field Guide is a small investment that'll help you make the most of your new camera.