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.
Summary of Contents for D5100
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