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

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More on Photography
The camera’s sensitivity to light can be adjusted according to the 
amount of light available. The higher the ISO sensitivity, the less 
light needed to make an exposure, allowing higher shutter 
speeds or smaller apertures. Choosing Auto allows the camera 
to set ISO sensitivity automatically in response to lighting 
conditions; to use auto in PSA, and M modes, select Auto ISO 
sensitivity control
 for the ISO sensitivity settings item in the 
shooting menu (
1
Display ISO sensitivity options.
Press the 
P button, then highlight the 
current ISO sensitivity in the 
information display and press 
J.
ISO Sensitivity
Mode
ISO sensitivity
i, j, %
Auto
P
SAM
100–25600 in steps of 1 EV
Other shooting modes
Auto; 100–25600 in steps of 1 EV
P button