Nikon D3100 User Manual page 57

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
~
and
@
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 ·0· button.
Press the
·0·
button again to place the cursor in the information display.
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Information display
?
@
®
~'~------!
·0' button
2
Display ISO sensitivity options.
Highlight the current ISO sensitivity in the
information display and press
@.
3
Choose an ISO sensitivity.
Highlight an option and press
€B).
To return to
~~~~~~g mode, press the shutter-release button ~ •
• Hi 1/Hi2
Pictures taken at these settings are more likely to be subject to noise (randomly-spaced
bright pixels, fog, or lines).
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