Cheetah-proof flashbulbs, custom wide-angle lenses, and cameras that take two photos at once: It's all in a day's work for Kenji Yamaguchi, a master photographic engineer at National Geographic. For 32 years, his custom contraptions have helped photographers capture iconic images on assignments all over the world. Read more about Kenji, and see a photo he helped make possible: goo.gl/NxWnYM PRODUCER: David Ehrenberg