Nikon D3100 - Manual (Page 87)

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ISO Sensitivity
“ISO sensitivity” is the digital equivalent of film speed. Choose from settings that
range from a value roughly equivalent to ISO 100 to one roughly equivalent to ISO
3200 in steps equivalent to 1 EV. For special situations, ISO sensitivity can be raised
above ISO 3200 by about 1 EV (Hi 1, equivalent to ISO 6400) or 2 EV (Hi 2, equivalent
to ISO 12800). Auto and scene modes also offer an AUTO option, which allows the
camera to set ISO sensitivity automatically in response to lighting conditions; AUTO is
selected automatically in
i and j modes. The higher the ISO sensitivity, the less
light needed to make an exposure, allowing higher shutter speeds or smaller
apertures.
1
Place the cursor in the information display.
If shooting information is not displayed in the monitor, press the P button.
Press the P button again to place the cursor in the information display.
2
Display ISO sensitivity options.
Highlight the current ISO sensitivity in the
information display and press
J.
3
Choose an ISO sensitivity.
Highlight an option and press J. To return to
shooting mode, press the shutter-release button
halfway.
Information display P button