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Photographer Gerd Ludwig, a master of TTL strobe lighting, discusses his technique for invisibly blending hand-held flash with available light.
via PDNPulse: http://pdnpulse.pdnonline.com/2016/09/gerd-ludwig-invisible-flash-technique.html
Ludwig explains the basics of his technique. He shows how he has applied it to images from his various assignments for National Geographic magazine, including a story about nightlife in Moscow. The images are also featured in his forthcoming book called minus 2/3: The Invisible Flash.