Nikon D7100 Product Manual - Page 183

Focusing in Live View To focus using autofocus, rotate the focus-mode selector to AF and follow the steps below to choose autofocus and AF-area modes. For information on focusing manually, see page 159. Focus-mode selector ❚❚ Choosing a Focus Mode The following autofocus modes are available in live view (note that full-time-servo AF is not available in g and i modes): Mode Description AF-S Single-servo AF: For stationary subjects. Focus locks when shutter-release button is pressed halfway. AF-F Full-time-servo AF: For moving subjects. Camera focuses continuously until shutterrelease button is pressed. Focus locks when shutter-release button is pressed halfway. To choose an autofocus mode, press the AF-mode button and rotate the main command dial until the desired mode is displayed in the monitor. AF-mode button Main command dial Monitor D Using Autofocus in Live View Use an AF-S lens. The desired results may not be achieved with other lenses or teleconverters. Note that in live view, autofocus is slower and the monitor may brighten or darken while the camera focuses. The focus point may sometimes be displayed in green when the camera is unable to focus. The camera may be unable to focus in the following situations: x • The subject contains lines parallel to the long edge of the frame • The subject lacks contrast • The subject in the focus point contains areas of sharply contrasting brightness, or includes spot lighting or a neon sign or other light source that changes in brightness • Flicker or banding appears under fluorescent, mercury-vapor, sodium-vapor, or similar lighting • A cross (star) filter or other special filter is used • The subject appears smaller than the focus point • The subject is dominated by regular geometric patterns (e.g., blinds or a row of windows in a skyscraper) • The subject is moving 155