Gerd Ludwig, a National Geographic veteran known for his powerful photo essays, is one of the leading documentary photographers of our time. As a photographer focusing on diverse cultural and environmental stories, Ludwig is often confronted with a wide range of low-light situations from classic street photography to portraiture, from scenes in bustling night clubs to intimate moments in churches many of which require additional lighting that must be created quickly, effectively, and discreetly. In Minus 2/3 The Invisible Flash: Crafting Light for Photographers in Field, Ludwig takes us behind the scenes of many of his most iconic images to share his approach to lighting with small flash. Equal parts inspiration and education, Minus 2/3 is straightforward and succinct, yet filled with numerous takeaways from one of today's leading photographers. Packed with beautiful, effective, and moving images, Minus 2/3 offers ideas, insight, and inspiration for photographers looking to subtly incorporate flash into their work.