Iso Sensitivity - Nikon D5100 Reference Manual

ISO Sensitivity

"ISO sensitivity" is the digital equivalent of film speed. The higher the ISO sensitivity,
the less light needed to make an exposure, allowing higher shutter speeds or smaller
apertures, but the more likely the image is to be affected by noise (randomly-spaced
bright pixels, fog, or lines; noise is particularly likely at settings of Hi 0.3–Hi 2).
Choosing Auto allows the camera to set ISO sensitivity automatically in response to
lighting conditions.
Mode
i, j, %
P, S, A, M
Other shooting modes
1
Place the cursor in the information display.
z
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.
54
AUTO
100–6400 in steps of 1/3 EV; Hi 0.3, Hi 0.7, Hi 1, Hi 2
AUTO; 100–6400 in steps of 1/3 EV; Hi 0.3, Hi 0.7, Hi 1, Hi 2
Information display
ISO sensitivity
P button