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■ Action stopping—Pro: electronic flash. When it comes to the ability to freeze
moving objects in their tracks, the advantage goes to electronic flash. The brief dura-
tion of electronic flash serves as a very high “shutter speed” when the flash is the
main or only source of illumination for the photo. Your D7000’s shutter speed may
be set for 1/250th second during a flash exposure, but if the flash illumination pre-
dominates, the effective exposure time will be the 1/1,000th to 1/50,000th second
or less duration of the flash, as you can see in Figure 12.4, in a shot by Cleveland
photographer Kris Bosworth, because the flash unit reduces the amount of light
released by cutting short the duration of the flash. The only fly in the ointment is
that, if the ambient light is strong enough, it may produce a secondary, “ghost”
exposure, as I’ll explain later in this chapter.
David Busch’s Nikon D7000 Guide to Digital SLR Photography400
Figure 12.4
Electronic flash
can freeze
almost any
action.