Nikon D300s manual Auto ISO Sensitivity Control

adjusted if underexposure would result at the shutter speed selected for Minimum shutter speed (1/4000–1 s). Slower

shutter speeds may be used if optimum exposure can not be achieved at the ISO sensitivity value selected for Maximum sensitivity. Press Jto exit when settings are complete.

When On is selected, the control panel and viewfinder show ISO-AUTO. When sensitivity is altered from the value selected by the user, these indicators blink and the altered value is shown in the viewfinder.

AAuto ISO Sensitivity Control

Noise is more likely at higher sensitivities. Use the High ISO NR option

in the shooting menu to reduce noise (see page 259). When a flash is used, the value selected for Minimum shutter speed is ignored in favor of the option selected for Custom Setting e1 (Flash sync speed, 0 281).

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.

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