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A former wedding photographer, entrepreneur and author, Gary Fong is widely known for his invention into “Lightsphere” which is a line of technique and accessories used for flash photography.
In this demonstration at Cologne Germany during Photokina, Gary Fong explains the concept known as overlaying to which available light exposure is used in conjunction with a flash of different levels of output
More info on this concept & products visit http://www.garyfong.com/