Nikon D3300 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. Noise (randomly-spaced bright 
pixels, fog, or lines) is however more likely at a setting of Hi 1, 
which is equivalent to ISO 25600). 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, %, I
Auto
P
SAM
100–12800 in steps of 1 EV; Hi 1
Other shooting modes
Auto; 100–12800 in steps of 1 EV; Hi 1
P button