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

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68 More on Photography
A
Cover the Viewfinder
To prevent light entering via the viewfinder from appearing in the 
photograph or interfering with exposure, we recommend that you 
cover the viewfinder with your hand or other objects such as an 
optional eyepiece cap (
0 268) when taking pictures without your eye 
to the viewfinder. To attach the cap, remove the rubber eyecup (q) 
and insert the cap as shown (w). Hold the camera firmly when 
removing the rubber eyecup.
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Using the Built-in Flash 
Before taking a photograph with the flash in modes that require the 
flash to be raised manually, press the 
M (Y) button to raise the flash 
and wait for the 
M indicator to be displayed in the viewfinder (0 38). 
Shooting will be interrupted if the flash is raised after the self-timer has 
started.
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The Setup Menu Self-Timer Option
For information on choosing the duration of the self-timer and the 
number of shots taken, see the Self-timer option in the setup menu 
(
Rubber eyecup
Eyepiece cap