Nikon D7100 Product Manual - Page 100
Getting Good Results with Autofocus, See Also, priority selection
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Autofocus mode can be selected by pressing the AFmode button and rotating the main command dial until the desired setting is displayed in the viewfinder or control panel. AF-mode button Main command dial AF-A AF-S AF-C A Getting Good Results with Autofocus N Autofocus does not perform well under the conditions listed below. The shutter release may be disabled if the camera is unable to focus under these conditions, or the in-focus indicator (I) may be displayed and the camera may sound a beep, allowing the shutter to be released even when the subject is not in focus. In these cases, focus manually (0 78) or use focus lock (0 76) to focus on another subject at the same distance and then recompose the photograph. There is little or no contrast between the subject and the background. Example: Subject is the same color as the background. The focus point contains objects at different distances from the camera. Example: Subject is inside a cage. The subject is dominated by regular geometric patterns. Example: Blinds or a row of windows in a skyscraper. The focus point contains areas of sharply contrasting brightness. Example: Subject is half in the shade. Background objects appear larger than the subject. Example: A building is in the frame behind the subject. The subject contains many fine details. Example: A field of flowers or other subjects that are small or lack variation in brightness. A See Also For information on using focus priority in continuous-servo AF, see Custom Setting a1 (AF-C priority selection, 0 231). For information on using release priority in single-servo AF, see Custom Setting a2 (AF-S priority selection, 0 231). See page 155 for information on the autofocus options available in live view or during movie recording. 72