Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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Technical Notes
❚❚ Focus
The focus mode can be selected using camera controls (
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.