Book excerpt: Mostly candid and spontaneous, documentary photography serves to preserve a moment in time. In Lens on Life, celebrated documentary photographer and author of the best-selling The Art of iPhoneography: A Guide to Mobile Creativity, Stephanie Calabrese Roberts, inspires you to explore, shoot, and share documentary photographs, guiding you as you define your own style. Illustrated with the author's striking artwork and diverse insight and perspectives from seasoned photographers including Elliott Erwitt, Elizabeth Fleming, Sion Fullana, Ed Kashi, John Loengard, Beth Rooney, and Rick Smolan, this book will sharpen your artistic intuition and give you the confidence to take on personal or professional documentary assignments. Full of advice that will challenge you and strengthen your photography, Lens on Life shows you how to capture an authentic view of your world.