Nikon D3400 Reference Manual - English - Page 331
Focus, Technical Notes, Autofocus, Manual Focus
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❚❚ Focus The focus mode can be selected using camera controls (0 69). Autofocus Focus is adjusted automatically when the camera is in autofocus mode (0 69). The focus ring can also be used to focus the camera if the shutter-release button is kept pressed halfway (or if the AF-ON button is kept pressed); this is known as "autofocus with manual override" (M/A). Autofocus will resume when the shutter-release button is pressed halfway (or the AF-ON button is pressed) a second time. Note that touching the focus ring while autofocus is in effect will change the focus position. Manual Focus When the camera is in manual focus mode, focus can be adjusted by rotating the lens focus ring (0 81). When the camera is off or the standby timer has expired, the focus ring can not be used to focus and rotating the zoom ring will change the focus position; before focusing, turn the camera on or press the shutter-release button to reactivate the standby timer. Users of D5, D810-series, Df, D750, D7200, D7100, and D5200 cameras should note that if the standby timer is allowed to expire, the focus position will change when the timer is restarted. Refocus before shooting. Longer standby times are recommended for manual focus and in other situations in which you may not release the shutter immediately after focusing. Technical Notes 307