Nikon D3000 Reference Manual

120

i

Adjust ISO sensitivity (

0 62).

❚❚Auto ISO Sensitivity

If Off is chosen for Auto ISO sensitivity in P, S, A, and M modes, 
ISO sensitivity will remain fixed at the value selected by the user 
(

0 62). 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 Max. sensitivity option in the Auto ISO 
sensitivity menu (choose lower values to prevent noise; 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 Min. 
shutter spd.  Slower shutter speeds will be used only if optimum exposure can not 
be achieved at the ISO sensitivity value selected for Max. sensitivity. If the ISO 
sensitivity selected by the user is higher than the value selected for Max. sensitivity, 
the value selected for Max. 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.

G button

➜ C shooting menu

A

Noise is more likely at higher sensitivities.  Use the Noise reduction option in the shooting 
menu to reduce noise (

0 122).  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.