Figure 20.3 shows a photograph taken with the flash located directly above the camera lens, so when the camera was held sideways for a vertical image the light was coming from the side and threw a very strong shadow behind the opposite side of the patient.
Figures 20.4 and 20.5 are two examples using an external camera-mounted flash system with dual flash heads. To give you an idea of the kind of control and flexibility you can get with an external flash, both of these images were captured using the same flash system.
In the first image, the two flash heads were positioned on either side of the camera lenses (Fig. 20.4). As we can see, the two light sources throw two shad-
ows behind the patient, but each shadow is softened somewhat by the opposing flash head.
In the second image, the flash unit was rotated by 90° (Fig. 20.5). When one of the heads was disabled, the result was a single light source positioned at the top of the frame, which throws a shadow that is mostly hidden behind the patient (Fig. 20.6).
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