Underexpose the ambient light by two-thirds of a stop and use main flash to brighten the white birch tree in the foreground. The trees separate better from the background, the fall colors intensify, and the tree bark is a brighter white. Nikon D2X, 70–200mm at 78mm, ISO 200, f/16, 1/2.5, Cloudy WB, Nikon S B-800 at +1.3 FEC.
2 Flash features and controls
The electronic flash unit is a simple device. It houses electronic circuits, a capacitor to store energy, and a flash tube. Power from batteries, or sometimes AC household power, is modified by the internal electronic circuits and stored in the capacitor. When you trigger the flash, ...
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