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Outdoor Flash Photography by Barbara Eddy, John Gerlach

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Western tiger swallowtails spread their wings to absorb heat during cool periods. The red lichen-covered rock is an attractive background. The ambient light is underexposed by one stop and main flash optimally exposes the butterfly. Canon 5D Mark III, 180mm macro, ISO 200, f/16, one second, Flash WB, Manual ambient exposure one stop underexposed, Canon 600EX-RT Speedlite on auto at +1 FEC.

8 Main flash

A flash unit utilized as the dominant light on the subject is called the main flash or main light, and is also known as the key flash or the key light. Barbara and I consider “main” as more descriptive than the word “key,” so we use main ...

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