Nikon D7000 manual Focus ring Autofocus

Chapter 3 ■ Nikon D7000 Roadmap 83

Figure 3.31 Filter thread

Lens hood alignment indicator

Lens hood bayonet

Focus ring

Autofocus/

Manual focus switch

Focus scale

Zoom ring

Zoom setting

Aperture lock

Aperture ring

■Focus scale. This is a readout found on many lenses that rotates in unison with the lens’s focus mechanism to show the distance at which the lens has been focused. It’s a useful indicator for double-checking autofocus, roughly evaluating depth-of-field, and for setting manual focus guesstimates. Chapter 11 deals with the mysteries of lenses and their controls in more detail.

■Zoom setting. These markings on the lens show the current focal length selected.

■Zoom ring. Turn this ring to change the zoom setting.

■Autofocus/Manual switch. Allows you to change from automatic focus to man- ual focus.

■Aperture ring. Some lenses have a ring that allows you to set a specific f/stop man- ually, rather than use the camera’s internal electronic aperture control. An aperture ring is useful when a lens is mounted on a non-automatic extension ring, bellows, or other accessory that doesn’t couple electronically with the camera. Aperture rings also allow using a lens on an older camera that lacks electronic control. In recent years, Nikon has been replacing lenses that have aperture rings with versions that only allow setting the aperture with camera controls.