Nikon 25214 D70 User's Guide - Page 74

Taking Photographs-Focus Focus Controlling How the Camera Focuses This section describes the options that control how your camera focuses: focus mode, focus-area selection, and AF-area mode. Focus Mode Focus mode is controlled by the focus mode se- lector on the front of the camera. Two modes are VIDEO OUT available: Option Description Camera focuses automatically when shutter-release button is pressed halfway. Operation depends on option selected for Custom Setting 2 (Autofocus; 139): • AF-S (single-servo autofocus): When camera focuses, beep sounds and in-focus indicator (●) appears in viewfinder. Focus remains locked while shutter-release button is pressed halfway (focus lock). Shutter can only be released when in-focus indicator is displayed (focus pri- ority). If subject was moving when shutter-release button was pressed AF halfway, camera will track subject until focusing is complete and the Autofocus shutter can be released (predictive focus tracking; 65). If subject stops moving before shutter is released, in-focus indicator will appear in viewfinder and focus will lock at this distance. • AF-C (continuous-servo autofocus): Camera focuses continuously while shutter-release button is pressed halfway. If subject moves, fo- cus will be adjusted to compensate (predictive focus tracking; 65). Photographs can be taken whether or not camera is in focus (release priority). M Manual Camera does not focus automatically; focus must be adjusted manually using the lens focusing ring. If maximum aperture of lens is f/5.6 or faster, viewfinder focus indicator can be used to confirm focus (electronic range finding; 74), but photographs can be taken at any time, whether or not camera is in focus. Choosing single-servo AF ensures a sharp, focused image. Continuous-servo AF may be a better choice with erratically-moving subjects. Manual focus is recommended when the camera is unable to focus using autofocus. 64