Nikon 1546 User Manual (en)

Adjust ISO sensitivity (0 74).
❚❚ISO Sensitivity Auto Control
If Off is chosen for ISO sensitivity auto control in PSA, and M 
modes, ISO sensitivity will remain fixed at the value selected by 
the user (0 74).  When On is chosen, ISO sensitivity will 
automatically be adjusted if optimal exposure can not be 
achieved at the value selected by the user (flash level is adjusted 
appropriately).  The maximum value for auto ISO sensitivity can 
be selected using the Maximum sensitivity option in the ISO sensitivity auto 
 menu (choose lower values to prevent noise; the minimum value for auto ISO 
sensitivity is automatically set to ISO 200).  In modes P and A, sensitivity will only be 
adjusted if underexposure would result at the shutter speed selected for Minimum 
shutter speed
.  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 
, 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
Auto ISO Sensitivity Control
Noise is more likely at higher sensitivities.  Use the High ISO NR option in the shooting 
menu to reduce noise (0 151).  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 SB-900, SB-800, SB-600, and SB-400 flash units), possibly preventing the 
camera from selecting slow shutter speeds.