Nikon D5100 Reference Manual - Page 173

ISO Sensitivity Settings, Auto ISO sensitivity control

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ISO Sensitivity Settings Adjust ISO sensitivity (0 54). G button ➜ C shooting menu ❚❚ Auto ISO sensitivity control If Off is chosen for Auto ISO sensitivity control in P, S, A, and M modes, ISO sensitivity will remain fixed at the value selected by the user (0 54). When On is chosen, ISO sensitivity will automatically be adjusted if optimal exposure can not be achieved at the value selected by the user (ISO sensitivity is adjusted appropriately when the flash is used). The maximum value for auto ISO sensitivity can be selected using the Maximum sensitivity option in the Auto ISO sensitivity control menu (choose lower values to prevent noise (randomly-spaced bright pixels, fog, or lines); the minimum value for auto ISO sensitivity is automatically set to ISO 100). In modes P and A, sensitivity will only be adjusted if underexposure would result at the shutter speed selected for Minimum shutter speed (1/2000-1 s; in modes S and M, sensitivity will be adjusted for optimal exposure at the shutter speed selected by the user). Slower shutter speeds will be used only if optimum exposure can not be achieved at the ISO sensitivity value selected for Maximum sensitivity. If the ISO sensitivity selected by the user is higher than the value selected for Maximum sensitivity, the value selected for Maximum sensitivity will be used instead. When On is selected, the viewfinder shows ISO-AUTO and the information display ISO-A. These indictors blink when sensitivity is altered from the value selected by the user. i A Auto ISO Sensitivity Control Noise (randomly-spaced bright pixels, fog, or lines) is more likely at higher sensitivities. Use the High ISO NR option in the shooting menu to reduce noise (0 154). Note that ISO sensitivity may be raised automatically when auto ISO sensitivity control is used in combination with slow sync flash modes (available with the built-in flash and optional SB-900, SB-800, SB-700, SB-600, and SB-400 flash units, possibly preventing the camera from selecting slow shutter speeds. 155

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155
i
Adjust ISO sensitivity (
0
54).
❚❚
Auto ISO sensitivity control
If
Off
is chosen for
Auto ISO sensitivity control
in
P
,
S
,
A
, and
M
modes, ISO sensitivity will remain fixed at the value selected by
the user (
0
54).
When
On
is chosen, ISO sensitivity will
automatically be adjusted if optimal exposure can not be
achieved at the value selected by the user (ISO sensitivity is
adjusted appropriately when the flash is used).
The maximum
value for auto ISO sensitivity can be selected using the
Maximum sensitivity
option
in the
Auto ISO sensitivity control
menu (choose lower values to prevent noise
(randomly-spaced bright pixels, fog, or lines); the minimum value for auto ISO
sensitivity is automatically set to ISO 100).
In modes
P
and
A
, sensitivity will only be
adjusted if underexposure would result at the shutter speed selected for
Minimum
shutter speed
(
1
/
2000
–1 s; in modes
S
and
M
, sensitivity will be adjusted for optimal
exposure at the shutter speed selected by the user).
Slower shutter speeds will be
used only if optimum exposure can not be achieved at the ISO sensitivity value
selected for
Maximum sensitivity
.
If the ISO sensitivity selected by the user is higher
than the value selected for
Maximum sensitivity
, the value selected for
Maximum
sensitivity
will be used instead.
When
On
is selected, the viewfinder shows
ISO-AUTO
and the
information display
ISO-A
.
These indictors blink when sensitivity
is altered from the value selected by the user.
ISO Sensitivity Settings
G
button
➜
C
shooting menu
A
Auto ISO Sensitivity Control
Noise (randomly-spaced bright pixels, fog, or lines) is more likely at higher sensitivities.
Use
the
High ISO NR
option in the shooting menu to reduce noise (
0
154).
Note that ISO
sensitivity may be raised automatically when auto ISO sensitivity control is used in
combination with slow sync flash modes (available with the built-in flash and optional
SB-900, SB-800, SB-700, SB-600, and SB-400 flash units, possibly preventing the camera from
selecting slow shutter speeds.