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Chapter 3 ✦ Choosing the Right Equipment for the Job
The drawback to this technique, shown in Figure 3-23, is that the same slow shutter speeds required to
achieve this effect also provide opportunities for ghosting. Ghosting is the blurry halo that happens when
your subject moves during the exposure.
Figure 3-22: When on-camera
flash is combined with a slow
shutter speed the background
light minimizes the appearance
of any shadows from the flash.
17mm, f/4, 1/15s, 800 ISO
Figure 3-23: The trick is in
finding the perfect shutter speed
and ISO combination that allows
some background light without
creating too much ghosting.
17mm, f/4, 1/8s, 400 ISO
Figures 3-24 through 3-26 illustrate the results you will see when using a flash in combination with very
slow shutter speeds. Some areas appear sharp where the flash froze the subject, while other areas
appear with double images or blurry halos around the subjects. The ambient light hitting your subject
after the flash is what creates the blurry areas. It takes a lot of practice and experimentation to deter-
mine just how slow you can set your shutter and still create acceptable images. You also have to adjust
your shutter speed depending on the subject. For example, people pictures should be sharper, while
dancing pictures can look very good with some ghosting and light streaks in the background.
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