Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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The Shooting Menu: Shooting Options
❚❚ Auto ISO Sensitivity control
This option is available with type E and G lenses (
the camera is in PSA, or M mode. If Off is selected, ISO sensitivity 
will remain fixed at the value selected by the user (
0 93). When 
On is chosen, ISO sensitivity will automatically be adjusted if 
optimal exposure can not be achieved at the value selected by 
the user. 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), but note that if the 
ISO sensitivity selected by the user is higher than that chosen for 
Maximum sensitivity, the value selected by the user will be 
used instead; 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
–30 s, or Auto
in modes S and M, sensitivity will be adjusted for optimal 
exposure at the shutter speed selected by the user). If Auto is 
selected, the camera will choose the minimum shutter speed 
based on the focal length of the lens. Slower shutter speeds will 
be used only if optimal exposure can not be achieved at the ISO 
sensitivity value selected for Maximum sensitivity.
When On is selected, the viewfinder 
shows ISO AUTO and the information 
display ISO-A. These indicators flash when 
sensitivity is altered from the value 
selected by the user.