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Actually, I never took flash with me when I traveled abroad. My approach to photographing people is entirely contrary to the use of flash- although I understand that there are consequences in the final result. I've explained these many reasons bit-by-bit with my posts.
Also, the Masai have really black skin, the harsh sun created deep shadows in their often deeply set eye sockets, and they have dark eyes.
Whether a traveler wants to explode a flash directly into the eyes of a spear-carrying Masai warrior when in a Masai village out in the middle of the Serengeti is an individual choice.
Me? No way!
My other candid images of the Masai can be found on FM by using "Kenya" as the search word on B&W and People forums.