As described in Chapter 6, the skeleton is divided into axial and appendicular portions (see Figures 6.1 and 7.1). The axial skeleton is structured from 80 bones segregated intothree major regions: the skull, vertebral column, and thoraciccage (Figure 7.1) . This part of the skeleton (1) forms the lon-gitudinal axis of the body, (2) supports the head, neck, and Chapter 7 The Skeleton 199 7 Figure 7.1 The human skeleton.
Above: Some cameras have a switch to set it to auto or manual focus. Manual focus, meanwhile, disables autofocus and enables you to adjust it yourself. This is useful when the focusing system can't find focus for whatever reason, such as when it's too dark or when there's little contrast in the scene.
No matter which shooting mode you're in -- from Automatic to Program or Manual -- you can shoot in manual focus mode. On the side of your lens, look for a switch labeled AF-MF, which is short for Autofocus and Manual Focus, respectively.When you're ready to shoot in MF mode, switch your lens to that setting. At this point, half-pressing the shutter -- what you'd normally do to find focus in AF mode -- is a useless action.o matter which shooting mode you're in -- from Automatic to Program or Manual -- you can shoot in manual focus mode. On the side of your lens, look for a switch labeled AF-MF, which is short for Autofocus and Manual Focus, respectively.